Detection protection device of power line, electric connection equipment and electric equipment

Abstract

The utility model discloses a detection protection device of a power line, an electric connection device and an electric device. The detection protection device comprises a switch module, an electric leakage detection module, an open circuit detection module and a trigger module. The electric leakage detection module comprises a first shielding conductor structure and a second shielding conductor structure; the first shielding conductor structure comprises a first end close to the input end of the power line, a second end close to the output end of the power line and a third end located between the first end and the second end; the second shielding conductor structure comprises a fourth end close to the input end, a fifth end close to the output end and a sixth end located between the fourth end and the fifth end; and the third end is connected with the sixth end. The feasibility and flexibility of the power line on electric leakage detection and shielding structure open circuit detection can be enriched, and the power supply safety of the power line can be improved.

Description

Technical Field

[0001] The utility model relates to the field of electrical technology, in particular to a detection and protection device for a power line, an electrical connection device and an electrical device. Background Art

[0002] A leakage current detection circuit breaker (LCDI) is a power connection device for electrical appliances. It can detect the leakage current of the power cord group through the leakage current detection line, and cut off the power connection of the appliance when a certain leakage current is detected to ensure safe use. In recent years, in addition to detecting the leakage current of the power cord through the leakage current detection line, leakage current detection circuit breakers have also put forward higher safety detection requirements, such as the need to detect whether the leakage current detection line is open.

[0003] At present, when performing leakage detection and open circuit detection of the leakage current detection line in the detection protection device of the power line, the leakage current detection line of the power line is generally connected in series by multiple leakage current detection lines, in series by a return line and the leakage current detection line, or in parallel by multiple leakage current detection lines. The method of constructing the detection path is relatively limited, and the flexibility and safety of the detection are insufficient. Utility Model Content

[0004] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art, and to provide a detection and protection device for a power line, an electrical connection device and an electrical equipment, which can enrich the feasibility and flexibility of leakage detection and shielding structure open circuit detection of the power line, and is conducive to improving the power supply safety of the power line.

[0005] In a first aspect, an embodiment of the utility model provides a detection protection device for a power line, wherein the power line includes a first current-carrying line and a second current-carrying line, and the detection protection device includes:

[0006] A switch module, used to control the power connection between the input end and the output end of the power line;

[0007] A leakage detection module, comprising a first shielded conductor structure covering the first current-carrying line and a second shielded conductor structure covering the second current-carrying line; the first shielded conductor structure is used to collect leakage signals of the first current-carrying line, and the second shielded conductor structure is used to collect leakage signals of the second current-carrying line; the first shielded conductor structure comprises a first end close to the input end of the power line, a second end close to the output end of the power line, and a third end between the first end and the second end; the second shielded conductor structure comprises a fourth end close to the input end, a fifth end close to the output end, and a sixth end between the fourth end and the fifth end; the third end is connected to the sixth end;

[0008] an open circuit detection module, connected to the first end, the second end, the fourth end and the fifth end respectively, the open circuit detection module being configured to generate an open circuit signal when at least a portion of the first shielding conductor structure and / or the second shielding conductor structure is open circuit;

[0009] A trigger module is coupled to the leakage detection module, the open circuit detection module and the switch module, and is configured to receive the leakage signal and / or the open circuit signal, and drive the switch module to disconnect the power connection in response to the leakage signal and / or the open circuit signal.

[0010] The detection and protection device for the power line provided by the embodiment of the utility model has at least the following beneficial effects: the first shielding conductor structure in the leakage detection module covers the first current-carrying line so that the leakage signal of the first current-carrying line can be collected, and the second shielding conductor structure in the leakage detection module covers the second current-carrying line so that the leakage signal of the second current-carrying line can be collected. On this basis, by connecting the third end in the middle of the first shielding conductor structure with the sixth end in the second shielding conductor structure, there is a connection point between the shielding conductor structures of the first current-carrying line and the second current-carrying line, and the two shielding conductor structures are no longer independent and separated. The open circuit detection module is respectively connected to the first end and the second end of the first shielding conductor structure and the fourth end and the fifth end of the second shielding conductor structure, so that the open circuit detection module can perform open circuit detection on a variety of different detection paths, such as a detection path from the first end of the first shielding conductor structure to the third end, then to the sixth end of the second shielding conductor structure, and finally to the fourth end of the second shielding conductor structure; a detection path from the first end of the first shielding conductor structure to the third end, then to the sixth end of the second shielding conductor structure, and finally to the fourth end of the second shielding conductor structure. a detection path from the second end to the third end of the first shielded conductor structure, then to the sixth end of the second shielded conductor structure, and finally to the fourth end of the second shielded conductor structure; a detection path from the second end to the third end of the first shielded conductor structure, then to the sixth end of the second shielded conductor structure, and finally to the fifth end of the second shielded conductor structure; in addition, the trigger module is coupled with the leakage detection module, the open circuit detection module and the switch module respectively, and can drive the switch module to disconnect the power connection when leakage occurs in the first current-carrying line or the second current-carrying line, or when at least a part of the first shielded conductor structure and / or the second shielded conductor structure is open circuit, so as to ensure the power supply safety of the power line; in the detection and protection device for the power line of the present embodiment, the first shielded conductor structure and the second shielded conductor structure formed with multiple detection segments can be combined, so as to construct a shielding network with multiple different detection paths, which greatly enriches the feasibility and flexibility of leakage detection and open circuit detection of the shielding structure of the power line, and is conducive to improving the power supply safety of the power line.

[0011] According to the detection protection device provided by some embodiments of the present invention, the trigger module includes a voltage stabilizing unit and a third switch unit that drives the switch module to disconnect the power connection when turned on, and the control pin of the third switch unit is connected to the open circuit detection module to obtain the open circuit signal; the negative pole of the voltage stabilizing unit is connected to the first shielding conductor structure and / or the second shielding conductor structure to obtain the leakage signal in the first shielding conductor structure and / or the second shielding conductor structure, and the positive pole is connected to the control pin of the third switch unit.

[0012] According to the detection protection device provided in some embodiments of the present invention, the negative electrode of the voltage stabilizing unit is connected to any one of the following:

[0013] the first end;

[0014] the second end;

[0015] the third end;

[0016] the fourth end;

[0017] the fifth end;

[0018] The sixth end.

[0019] According to the detection protection device provided by some embodiments of the present utility model, the open circuit detection module includes a first switch unit and a second switch unit;

[0020] One end of the first switch unit is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the trigger module, the open circuit detection module further includes a first bias unit for providing a switch-on signal to the first switch unit, one end of the first bias unit is connected to the first end, and the other end is connected to the fourth end;

[0021] One end of the second switch unit is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the trigger module. The open circuit detection module also includes a second bias unit for providing a conduction switching signal to the second switch unit, one end of the second bias unit is connected to the second end, and the other end is connected to the fifth end.

[0022] According to the detection and protection device provided by some embodiments of the present utility model, the first bias unit is configured to: when any part of the first shielded conductor structure and the second shielded conductor structure between the first end and the fourth end is open-circuited, provide a switch-on signal to the first switch unit to turn on the first switch unit, so that the first switch unit sends an open-circuit signal to the trigger module; the second bias unit is configured to: when any part of the first shielded conductor structure and the second shielded conductor structure between the second end and the fifth end is open-circuited, provide a switch-on signal to the second switch unit to turn on the second switch unit, so that the second switch unit sends an open-circuit signal to the trigger module.

[0023] According to the detection and protection device provided by some embodiments of the present utility model, the first switching unit includes a first transistor, the first bias unit includes a first resistor, the open circuit detection module also includes a second resistor and a third resistor, one end of the first resistor is connected to the first end, the emitter of the first transistor and one end of the second resistor, the other end of the second resistor is connected to the first current-carrying line and one of the second current-carrying lines, the other end of the first resistor is connected to the fourth end, the base of the first transistor and one end of the third resistor, the other end of the third resistor is connected to the other of the first current-carrying line and the second current-carrying line, and the collector of the first transistor is connected to the trigger module.

[0024] According to the detection and protection device provided by some embodiments of the present utility model, the second switch unit includes a second transistor, the second bias unit includes a fourth resistor, the open circuit detection module also includes a fifth resistor and a sixth resistor, one end of the fourth resistor is connected to the second end, the emitter of the second transistor and one end of the fifth resistor, the other end of the fifth resistor is connected to the first current-carrying line and one of the second current-carrying lines, the other end of the fourth resistor is connected to the fifth end, the base of the second transistor and one end of the sixth resistor, the other end of the sixth resistor is connected to the other of the first current-carrying line and the second current-carrying line, and the collector of the second transistor is connected to the trigger module.

[0025] According to the detection protection device provided by some embodiments of the present utility model, the open circuit detection module includes a first switch unit and a second switch unit;

[0026] One end of the first switch unit is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the trigger module, the open circuit detection module further includes a first bias unit for providing a switch-on signal to the first switch unit, one end of the first bias unit is connected to the first end, and the other end is connected to the fifth end;

[0027] One end of the second switch unit is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the trigger module. The open circuit detection module also includes a second bias unit for providing a conduction switching signal for the second switch unit, one end of the second bias unit is connected to the second end, and the other end is connected to the fourth end.

[0028] According to the detection and protection device provided by some embodiments of the present invention, the trigger module also includes a trip coil for generating electromagnetic force to drive the switch module to disconnect the power connection, and the trip coil and the third switch unit are connected in series between the first current-carrying line and the second current-carrying line.

[0029] According to the detection protection device provided by some embodiments of the present invention, the third switching unit includes a thyristor, and the trigger module also includes a seventh resistor. The control electrode of the thyristor is respectively connected to one end of the seventh resistor, the positive electrode of the voltage stabilizing unit and the open circuit detection module, the other end of the seventh resistor and the cathode of the thyristor are connected to the first current-carrying line, and the anode of the thyristor is connected to the second current-carrying line through the tripping coil.

[0030] According to the detection protection device provided by some embodiments of the present invention, the trigger module also includes a first capacitor connected in parallel with the seventh resistor.

[0031] According to the detection and protection device provided by some embodiments of the present invention, the trigger module also includes a first diode and a second diode, the other end of the seventh resistor and the cathode of the thyristor are connected to the anode of the first diode and the anode of the second diode, the cathode of the first diode is connected to the first current-carrying line, and the cathode of the second diode is connected to the connection point between the thyristor and the tripping coil.

[0032] The detection and protection device provided according to some embodiments of the utility model further includes a leakage simulation module, which includes a first test switch, one end of which is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the first shielding conductor structure and / or the second shielding conductor structure.

[0033] According to the detection and protection device provided by some embodiments of the utility model, the leakage simulation module also includes an eighth resistor and a ninth resistor, the other end of the first test switch is respectively connected to one end of the eighth resistor and one end of the ninth resistor, and the other end of the eighth resistor and the other end of the ninth resistor are respectively connected to two of the first end, the second end, the third end, the fourth end, the fifth end and the sixth end.

[0034] According to some embodiments of the present invention, the detection and protection device further includes a second test switch, one end of which is connected to the first current-carrying line or the second current-carrying line, and the other end of which is connected to a control pin of a third switch unit.

[0035] The detection and protection device provided according to some embodiments of the utility model further includes a leakage simulation module, which includes a third test switch and a fourteenth resistor, one end of the third test switch is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the first shielding conductor structure and / or the second shielding conductor structure through the fourteenth resistor, and the fourteenth resistor is configured to: when the third test switch is pressed and the open circuit detection module fails, adjust the potential of the negative electrode of the voltage stabilizing unit to prevent the voltage stabilizing unit from being broken down.

[0036] According to the detection protection device provided by some embodiments of the present invention, the trigger module also includes a tenth resistor and an eleventh resistor, the negative electrode of the voltage stabilizing unit is connected to the first shielding conductor structure and / or the second shielding conductor structure through the eleventh resistor, and the open circuit detection module is connected to the negative electrode of the voltage stabilizing unit through the tenth resistor, so that the third switch unit obtains the open circuit signal through the tenth resistor.

[0037] According to the detection protection device provided by some embodiments of the present utility model, the first switch unit includes a first transistor, and the first bias unit includes a first resistor and a twelfth resistor; the second switch unit includes a second transistor, and the second bias unit includes a fourth resistor and a thirteenth resistor; the open circuit detection module also includes a second resistor, a third resistor, a fifth resistor and a sixth resistor; the emitter of the first transistor is connected to one end of the first resistor, the first end and one end of the second resistor, the base of the first transistor is connected to the other end of the first resistor and one end of the twelfth resistor, and the other end of the twelfth resistor is connected to the fourth end and one end of the third resistor; the second transistor The emitter of the transistor is connected to one end of the fourth resistor, the second end and one end of the fifth resistor, the base of the second triode is connected to the other end of the fourth resistor and one end of the thirteenth resistor, and the other end of the thirteenth resistor is connected to the fifth end and one end of the sixth resistor; the other end of the second resistor is connected together with the other end of the fifth resistor and connected to one of the first current-carrying line and the second current-carrying line, the other end of the third resistor is connected together with the other end of the sixth resistor and connected to the other of the first current-carrying line and the second current-carrying line, and the collector of the first triode is connected together with the collector of the second triode and connected to the trigger module.

[0038] According to the detection and protection device provided by some embodiments of the present utility model, the trigger module includes a voltage stabilizing unit and a third switch unit that drives the switch module to disconnect the power connection when turned on, and the control pin of the third switch unit is connected to the collector of the first transistor and the collector of the second transistor to obtain the open circuit signal; the negative electrode of the voltage stabilizing unit is connected to the first shielding conductor structure and / or the second shielding conductor structure to obtain the leakage signal in the first shielding conductor structure and / or the second shielding conductor structure, and the positive electrode of the voltage stabilizing unit is connected to the control pin of the third switch unit.

[0039] The detection and protection device provided according to some embodiments of the utility model further includes a leakage simulation module, which includes a third test switch, one end of the third test switch is connected to the connection point between the second resistor and the fifth resistor, and the other end of the third test switch is connected to the first shielding conductor structure and / or the second shielding conductor structure.

[0040] According to the detection protection device provided by some embodiments of the utility model, the leakage simulation module also includes a fourteenth resistor, the other end of the third test switch is connected to one end of the fourteenth resistor, and the other end of the fourteenth resistor is connected to the third end; the negative electrode of the voltage stabilizing unit is connected to the sixth end; the fourteenth resistor is configured as: when the third test switch is pressed and the open circuit detection module fails, the potential of the negative electrode of the voltage stabilizing unit is adjusted to prevent the voltage stabilizing unit from being broken down.

[0041] According to some embodiments of the present utility model, the detection and protection device further includes a leakage simulation module;

[0042] The open circuit detection module includes a first triode, a first voltage dividing unit, a second triode and a second voltage dividing unit; the first voltage dividing unit includes a second resistor, a first resistor, a twelfth resistor and a third resistor connected in series in sequence, and the second voltage dividing unit includes a fifth resistor, a fourth resistor, a thirteenth resistor and a sixth resistor connected in series in sequence; the connection point between the second resistor and the first resistor is connected to the first end and the emitter of the first triode; the connection point between the first resistor and the twelfth resistor is connected to the base of the first triode; the connection point between the twelfth resistor and the third resistor is connected to the fourth end; the connection point between the fifth resistor and the fourth resistor is connected to the second end and the emitter of the second triode; the connection point between the fourth resistor and the thirteenth resistor is connected to the base of the second triode; the connection point between the thirteenth resistor and the sixth resistor is connected to the fifth end; the second resistor and the fifth resistor are connected together and connected to the second current-carrying line, and the third resistor and the sixth resistor are connected together and connected to the first current-carrying line;

[0043] The trigger module includes a voltage stabilizing unit and a third switch unit that drives the switch module to disconnect the power connection when turned on; the control pin of the third switch unit is connected to the collector of the first transistor and the collector of the second transistor to obtain the open circuit signal; the positive electrode of the voltage stabilizing unit is connected to the control pin of the third switch unit, and the negative electrode is connected to the sixth end to obtain the leakage signal;

[0044] The leakage simulation module includes a third test switch and a fourteenth resistor; one end of the third test switch is connected to a connection point between the second resistor and the fifth resistor, the other end of the third test switch is connected to one end of the fourteenth resistor, and the other end of the fourteenth resistor is connected to the third end.

[0045] In a second aspect, an embodiment of the utility model provides an electrical connection device, comprising the detection and protection device, a shell and the power cord as described in the embodiment of the first aspect above, wherein the power cord is connected to the shell, and the switch module, the open circuit detection module and the trigger module are arranged in the shell.

[0046] In a third aspect, an embodiment of the utility model provides an electrical device, including a load device and the electrical connection device as described in the embodiment of the second aspect above, wherein the output end of the power line is connected to the load device.

[0047] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by practicing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures specifically pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The accompanying drawings are used to provide a further understanding of the technical solution of the utility model and constitute a part of the specification. Together with the embodiments of the utility model, they are used to explain the technical solution of the utility model and do not constitute a limitation on the technical solution of the utility model.

[0049] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0050] Figure 1 It is a module principle block diagram of the detection and protection device provided by the embodiment of the utility model;

[0051] Figure 2 This is a circuit schematic diagram of the detection and protection device provided in the first embodiment of the utility model;

[0052] Figure 3 This is a circuit diagram of the detection and protection device provided in the second embodiment of the present utility model;

[0053] Figure 4 This is a circuit schematic diagram of the detection and protection device provided in the third embodiment of the present utility model;

[0054] Figure 5 This is a circuit diagram of the detection and protection device provided in the fourth embodiment of the utility model;

[0055] Figure 6 This is a circuit schematic diagram of the detection and protection device provided in Embodiment 5 of the present utility model;

[0056] Figure 7 It is a schematic diagram of the conduction path on the first shielding conductor structure and the second shielding conductor structure of the detection protection device provided in the first embodiment of the utility model when the part of the first shielding conductor structure between the first end and the third end is open;

[0057] Figure 8 It is a schematic diagram of the conduction path on the first shielding conductor structure and the second shielding conductor structure when the portion of the first shielding conductor structure between the second end and the third end is open in the detection protection device provided in the first embodiment of the utility model;

[0058] Fig. 9 It is a schematic diagram of the conduction path on the first shielding conductor structure and the second shielding conductor structure when the connecting conductor between the third end and the sixth end of the detection protection device provided in the first embodiment of the utility model is open circuited;

[0059] Fig.10 It is a schematic diagram of the conduction path on the first shielding conductor structure and the second shielding conductor structure when the portion of the second shielding conductor structure between the fourth end and the sixth end is open in the detection protection device provided in the first embodiment of the utility model;

[0060] Fig.11 It is a schematic diagram of the conduction path on the first shielding conductor structure and the second shielding conductor structure when the part of the second shielding conductor structure between the fifth end and the sixth end is open when the detection protection device provided by the first embodiment of the utility model;

[0061] Fig.12 This is a circuit schematic diagram of the detection and protection device provided in Embodiment 6 of the present utility model;

[0062] Fig.13 This is a circuit diagram of the detection and protection device provided in Embodiment 7 of the present utility model;

[0063] Fig.14 This is a circuit schematic diagram of the detection and protection device provided in Embodiment 8 of the present utility model;

[0064] Fig.15 It is a structural schematic diagram of an electrical connection device provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0065] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0066] In the description of the embodiments of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, "above", "below", "within", etc. are understood to include the number itself, "at least one" means one or more, "at least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. If there is a description of "first", "second", etc., it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0067] It should be noted that the words such as setting, installing, and connecting in the embodiments of the present invention should be understood in a broad sense, and the technical personnel in the relevant technical field can reasonably determine the specific meanings of the above words in the embodiments of the present invention in combination with the specific content of the technical solution. For example, the term "connection" can be a mechanical connection, an electrical connection, or mutual communication; it can be directly connected or indirectly connected through an intermediate medium.

[0068] It should be noted that the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0069] A leakage current detection circuit breaker (LCDI) is a power connection device for electrical appliances, which can detect the leakage current of a power line group through a leakage current detection line, and cut off the power connection of the electrical appliance when a certain leakage current is detected, to ensure safe use. In recent years, in addition to the need to detect the leakage current of the power line through the leakage current detection line, the leakage current detection circuit breaker has also put forward higher safety detection requirements, such as the need to detect whether the leakage current detection line has an open circuit. At present, in the detection and protection device of the power line, when performing leakage detection and open circuit detection of the leakage current detection line, the leakage current detection line of the power line is generally connected in series by multiple leakage current detection lines, in series by a return line and the leakage current detection line, or in parallel by multiple leakage current detection lines. The way of constructing the detection path is relatively limited, and the flexibility and safety of the detection are insufficient.

[0070] Based on this, the embodiments of the utility model provide a detection and protection device for a power line, an electrical connection device and an electrical equipment, which can enrich the feasibility and flexibility of leakage detection and shielding structure open circuit detection of the power line, and are conducive to improving the power supply safety of the power line.

[0071] The following is a further description of the embodiments of the present invention in conjunction with the accompanying drawings.

[0072] Figure 1 It is a module principle block diagram of the detection and protection device provided by the embodiment of the utility model; Figure 2 This is a circuit diagram of the detection and protection device provided by the embodiment of the utility model. Figure 1 and Figure 2 A first aspect of the present utility model provides a detection and protection device for a power line, wherein the power line includes a first current-carrying line 110 and a second current-carrying line 120 .

[0073] It is understandable that when the power line supplies power to an electrical device using two-phase alternating current, one of the following two situations may be true: the first current-carrying line 110 is a live line L, and the second current-carrying line 120 is a neutral line N; the first current-carrying line 110 is a neutral line N, and the second current-carrying line 120 is a live line L. When the power line supplies power to an electrical device using three-phase alternating current, one of the following three situations may be true: the first current-carrying line 110 is a live line L1, and the second current-carrying line 120 is a neutral line N; the first current-carrying line 110 is a neutral line N, and the second current-carrying line 120 is a live line L1; the first current-carrying line 110 is a live line L1, and the second current-carrying line 120 is a live line L2. Below, the case where the first current-carrying line 110 is a live line L, and the second current-carrying line 120 is a neutral line N is used as an example for explanation, and the other situations can be obtained similarly.

[0074] The detection and protection device includes a switch module 210, a leakage detection module 220, an open circuit detection module 230 and a trigger module 240, wherein:

[0075] The switch module 210 is used to control the power connection between the input end and the output end of the power line; Figure 2 As shown, the switch module 210 is provided with switch terminals on the first current-carrying line 110 and the second current-carrying line 120. When the switch terminal of the switch module 210 is closed, the power connection between the input end and the output end of the power line is conducted; when the switch terminal of the switch module 210 is opened, the power connection between the input end and the output end of the power line is disconnected.

[0076] The leakage detection module 220 includes a first shielding conductor structure 221 covering the first current-carrying line 110 and a second shielding conductor structure 222 covering the second current-carrying line 120; the first shielding conductor structure 221 is used to collect the leakage signal of the first current-carrying line 110, and the second shielding conductor structure 222 is used to collect the leakage signal of the second current-carrying line 120; the first shielding conductor structure 221 includes a first end a close to the input end of the power line, a second end b close to the output end of the power line, and a third end c located between the first end a and the second end b; the second shielding conductor structure 222 includes a fourth end d close to the input end, a fifth end e close to the output end, and a sixth end f located between the fourth end d and the fifth end e; the third end c is connected to the sixth end f. It can be understood that the first shielding conductor structure 221 in the leakage detection module 220 covers the first current-carrying line 110 so that the leakage signal of the first current-carrying line 110 can be collected, and the second shielding conductor structure 222 in the leakage detection module 220 covers the second current-carrying line 120 so that the leakage signal of the second current-carrying line 120 can be collected. On this basis, by connecting the third end c in the middle of the first shielding conductor structure 221 with the sixth end f in the second shielding conductor structure 222, there is a connection point between the shielding conductor structures of the first current-carrying line 110 and the second current-carrying line 120, and the two shielding conductor structures are no longer independent and separated.

[0077] The open circuit detection module 230 is respectively connected to the first end a, the second end b, the fourth end d and the fifth end e, and the open circuit detection module 230 is configured to generate an open circuit signal when at least a portion of the first shielding conductor structure 221 and / or the second shielding conductor structure 222 is open circuit; it can be understood that the open circuit detection module 230 is respectively connected to the first end a and the second end b of the first shielding conductor structure 221, the fourth end d and the fifth end e of the second shielding conductor structure 222, so that the open circuit detection module 230 can simultaneously perform open circuit detection on multiple different detection paths, for example, from the first end a of the first shielding conductor structure 221 to the third end c, and then to the sixth end of the second shielding conductor structure 222. f, and finally to the fourth end d of the second shielding conductor structure 222; a detection path from the first end a of the first shielding conductor structure 221 to the third end c, then to the sixth end f of the second shielding conductor structure 222, and finally to the fifth end e of the second shielding conductor structure 222; a detection path from the second end b of the first shielding conductor structure 221 to the third end c, then to the sixth end f of the second shielding conductor structure 222, and finally to the fourth end d of the second shielding conductor structure 222; a detection path from the second end b of the first shielding conductor structure 221 to the third end c, then to the sixth end f of the second shielding conductor structure 222, and finally to the fifth end e of the second shielding conductor structure 222.

[0078] The trigger module 240 is coupled to the leakage detection module 220 , the open circuit detection module 230 and the switch module 210 , and is configured to receive a leakage signal and / or an open circuit signal, and drive the switch module 210 to disconnect the power connection in response to the leakage signal and / or the open circuit signal.

[0079] According to the detection and protection device for the power line provided in the embodiment of the utility model, the trigger module 240 is coupled with the leakage detection module 220, the open circuit detection module 230 and the switch module 210 respectively, and can drive the switch module 210 to disconnect the power connection when leakage occurs in the first current-carrying line 110 or the second current-carrying line 120, or when at least a part of the first shielding conductor structure 221 and / or the second shielding conductor structure 222 is open circuit, so as to ensure the power supply safety of the power line; in the detection and protection device for the power line of this embodiment, the first shielding conductor structure 221 and the second shielding conductor structure 222 formed with multiple detection segments can be combined, so as to construct a shielding network with multiple different detection paths, which greatly enriches the feasibility and flexibility of leakage detection and open circuit detection of the shielding structure of the power line, and is conducive to improving the power supply safety of the power line.

[0080] Reference Figure 2 In the detection protection device provided in some embodiments of the present invention, the trigger module 240 includes a voltage stabilizing unit ZD1 and a third switch unit 241 that drives the switch module 210 to disconnect the power connection between the input end and the output end of the power line when turned on. The control pin of the third switch unit 241 is connected to the open circuit detection module 230 to obtain an open circuit signal; the negative electrode of the voltage stabilizing unit ZD1 is connected to the first shielding conductor structure 221 and / or the second shielding conductor structure 222 to obtain a leakage signal in the first shielding conductor structure 221 and / or the second shielding conductor structure 222, and the positive electrode of the voltage stabilizing unit ZD1 is connected to the control pin of the third switch unit 241.

[0081] It can be understood that since the first shielding conductor structure 221 and the second shielding conductor structure 222 have been connected together through the third end c of the first shielding conductor structure 221 and the sixth end f of the second shielding conductor structure 222, therefore, when there is no short circuit between the first shielding conductor structure 221, the second shielding conductor structure 222 and the connecting conductor between the third end c and the sixth end f, the negative electrode of the voltage stabilizing unit ZD1 only needs to be connected to any point in the first shielding conductor structure 221 and the second shielding conductor structure 222, and the leakage signal detected at any other position of the first shielding conductor structure 221 and the second shielding conductor structure 222 can be transmitted to the negative electrode of the voltage stabilizing unit ZD1.

[0082] In the detection and protection device provided in some embodiments of the present invention, the negative electrode of the voltage stabilizing unit ZD1 is connected to any one of the following: the first terminal a; the second terminal b; the third terminal c; the fourth terminal d; the fifth terminal e; and the sixth terminal f.

[0083] It can be understood that the first end a, the second end b and the third end c are the wiring points that have been led out on the first shielding conductor structure 221, and the fourth end d, the fifth end e and the sixth end f are the wiring points that have been led out on the second shielding conductor structure 222. Therefore, the negative pole of the voltage stabilizing unit ZD1 is connected to any one of the above six ends, which has the advantage of convenient wiring.

[0084] It should be noted that the control pin of the third switch unit 241 can be directly connected to the open circuit detection module 230 to obtain the open circuit signal, or can be indirectly connected to the open circuit detection module 230, for example, referring to Figure 2 As shown, the trigger module 240 also includes a tenth resistor R10, and the control pin of the third switch unit 241 is indirectly connected to the open circuit detection module 230 through the tenth resistor R10; similarly, the negative electrode of the voltage stabilizing unit ZD1 can be directly connected to the first shielding conductor structure 221 and / or the second shielding conductor structure 222, or indirectly connected to the first shielding conductor structure 221 and / or the second shielding conductor structure 222, for example, referring to Figure 2 As shown, the trigger module 240 further includes an eleventh resistor R11 , and the cathode of the voltage stabilizing unit ZD1 is connected to the first shielding conductor structure 221 and / or the second shielding conductor structure 222 via the eleventh resistor R11 .

[0085] Reference Figure 2 In the detection and protection device provided in some embodiments of the present invention, the negative electrode of the voltage stabilizing unit ZD1 is connected to any one of the first end a, the second end b, the third end c, the fourth end d, the fifth end e, and the sixth end f through the eleventh resistor R11.

[0086] Reference Figure 2 In the detection and protection device provided in some embodiments of the present utility model, the open circuit detection module 230 includes a first switch unit 231 and a second switch unit 232;

[0087] One end of the first switch unit 231 is connected to the first current-carrying line 110 or the second current-carrying line 120, and the other end is connected to the trigger module 240. The open circuit detection module 230 also includes a first bias unit for providing a switch-on signal to the first switch unit 231. One end of the first bias unit is connected to the first end a, and the other end is connected to the fourth end d.

[0088] One end of the second switch unit 232 is connected to the first current-carrying line 110 or the second current-carrying line 120, and the other end is connected to the trigger module 240. The open circuit detection module 230 also includes a second bias unit for providing a conduction switch signal to the second switch unit 232. One end of the second bias unit is connected to the second end b, and the other end is connected to the fifth end e.

[0089] In this embodiment, since the two ends of the first bias unit are respectively connected to the first end a and the fourth end d, and the first end a and the fourth end d are short-circuited by the portion of the first shielding conductor structure 221 located between the first end a and the third end c, the connecting conductor between the third end c and the sixth end f, and the portion of the second shielding conductor structure 222 located between the sixth end f and the fourth end d, the two ends of the first bias unit are short-circuited, and the first switch unit 231 cannot be provided with a switch-on signal; similarly, since the two ends of the second bias unit are respectively connected to the second end b and the fifth end e, and the second end b and the fifth end e are short-circuited by the portion of the first shielding conductor structure 221 located between the second end b and the third end c, the connecting conductor between the third end c and the sixth end f, and the portion of the second shielding conductor structure 222 located between the sixth end f and the fifth end e, the two ends of the second bias unit are short-circuited, and the second switch unit 232 cannot be provided with a switch-on signal.

[0090] Reference Figure 2 In the detection and protection device provided in some embodiments of the utility model, the first bias unit is configured as follows: when any part of the first shielded conductor structure 221 and the second shielded conductor structure 222 between the first end a and the fourth end d is open-circuited, a switch-on signal is provided to the first switch unit 231 to turn on the first switch unit 231, so that the first switch unit 231 sends an open-circuit signal to the trigger module 240; the second bias unit is configured as follows: when any part of the first shielded conductor structure 221 and the second shielded conductor structure 222 between the second end b and the fifth end e is open-circuited, a switch-on signal is provided to the second switch unit 232 to turn on the second switch unit 232, so that the second switch unit 232 sends an open-circuit signal to the trigger module 240.

[0091] It should be noted that, in the present embodiment, when any part of the first shielding conductor structure 221 and the second shielding conductor structure 222 between the first end a and the fourth end d is open-circuited, that is, when the part of the first shielding conductor structure 221 between the first end a and the third end c is open-circuited, or when the part of the second shielding conductor structure 222 between the sixth end f and the fourth end d is open-circuited, the two ends of the first bias unit will no longer be short-circuited, so that a switch-on signal can be provided to the first switch unit 231, so that the first switch unit 231 is turned on and then, under the action of the electric energy provided by the first current-carrying line 110 or the second current-carrying line 120, the trigger module 240 is triggered. Similarly, when any part of the first shielded conductor structure 221 and the second shielded conductor structure 222 between the second end b and the fifth end e is open-circuited, that is, when the part of the first shielded conductor structure 221 between the second end b and the third end c is open-circuited, or when the part of the second shielded conductor structure 222 between the sixth end f and the fifth end e is open-circuited, the two ends of the second bias unit will no longer be short-circuited, so that a switch conduction signal can be provided to the second switch unit 232, so that the second switch unit 232 is turned on and then sends an open-circuit signal to the trigger module 240 under the action of the electric energy provided by the first current-carrying line 110 or the second current-carrying line 120. It should also be noted that when the connecting conductor between the third end c and the sixth end f is disconnected, the first end a and the fourth end d, and the second end b and the fifth end e will no longer be short-circuited, that is, both ends of the first bias unit and both ends of the second bias unit will no longer be short-circuited, so that the first switch unit 231 and the second switch unit 232 can be provided with a switch conduction signal at the same time, thereby causing the first switch unit 231 and the second switch unit 232 to send an open circuit signal to the trigger module 240 at the same time.

[0092] Reference Figure 2 In the detection protection device provided in some embodiments of the present utility model, the first switch unit 231 includes a first transistor Q1, the first bias unit includes a first resistor R1, the open circuit detection module 230 also includes a second resistor R2 and a third resistor R3, one end of the first resistor R1 is connected to the first end a, the emitter of the first transistor Q1 and one end of the second resistor R2, the other end of the second resistor R2 is connected to the second current-carrying line 120, the other end of the first resistor R1 is connected to the fourth end d, the base of the first transistor Q1 and one end of the third resistor R3, the other end of the third resistor R3 is connected to the first current-carrying line 110, and the collector of the first transistor Q1 is connected to the trigger module 240. It can be understood that the collector of the first transistor Q1 can be directly connected to the control pin of the third switch unit 241 in the trigger module 240, and can also be indirectly connected to the control pin of the third switch unit 241 in the trigger module 240, for example, referring to Figure 2As shown, the collector of the first transistor Q1 is connected to the control pin of the third switch unit 241 in the trigger module 240 through the tenth resistor R10.

[0093] In this embodiment, the two ends of the first resistor R1 are respectively connected to the first end a and the fourth end d, thereby being short-circuited. The first resistor R1 does not bear voltage division, so that the emitter and the base of the first transistor Q1 are equipotential points, and the first resistor R1 does not provide a bias voltage to the emitter junction of the first transistor Q1, and the first transistor Q1 cannot be turned on; when the part of the first shielding conductor structure 221 located between the first end a and the third end c is open, or when the part of the second shielding conductor structure 222 located between the sixth end f and the fourth end d is open, or when the connecting conductor between the third end c and the sixth end f is disconnected, the two ends of the first resistor R1 will no longer be short-circuited and can bear voltage division, thereby providing a bias voltage to the emitter junction of the first transistor Q1 to turn on the first transistor Q1.

[0094] It should be noted that Figure 2 The trigger module 240 shown further includes a trip coil Lx and a first diode D1, wherein the end of the second resistor R2 connected to the second current-carrying line 120 is not directly connected to the second current-carrying line 120, but is connected to the second current-carrying line 120 via the trip coil Lx. It is understood that in some other embodiments, the end of the second resistor R2 connected to the second current-carrying line 120 can also be directly connected to the second current-carrying line 120 without being connected to the second current-carrying line 120 via the trip coil Lx. Similarly, the end of the third resistor R3 connected to the first current-carrying line 110 is not directly connected to the first current-carrying line 110, but is connected to the first current-carrying line 110 via the first diode D1. It is understood that in some other embodiments, the end of the third resistor R3 connected to the first current-carrying line 110 can also be directly connected to the first current-carrying line 110 without being connected to the first current-carrying line 110 via the first diode D1.

[0095] Reference Figure 2In the detection protection device provided in some embodiments of the present utility model, the second switch unit 232 includes a second transistor Q2, the second bias unit includes a fourth resistor R4, the open circuit detection module 230 also includes a fifth resistor R5 and a sixth resistor R6, one end of the fourth resistor R4 is connected to the second end b, the emitter of the second transistor Q2 and one end of the fifth resistor R5, the other end of the fifth resistor R5 is connected to the second current-carrying line 120, the other end of the fourth resistor R4 is connected to the fifth end e, the base of the second transistor Q2 and one end of the sixth resistor R6, the other end of the sixth resistor R6 is connected to the first current-carrying line 110, and the collector of the second transistor Q2 is connected to the trigger module 240. It can be understood that the collector of the second transistor Q2 can be directly connected to the control pin of the third switch unit 241 in the trigger module 240, or can be indirectly connected to the control pin of the third switch unit 241 in the trigger module 240, for example, referring to Figure 2 As shown, the collector of the second transistor Q2 is connected to the control pin of the third switch unit 241 in the trigger module 240 through the tenth resistor R10.

[0096] In this embodiment, the two ends of the fourth resistor R4 are respectively connected to the second end b and the fifth end e, thereby being short-circuited. The fourth resistor R4 does not bear voltage division, so that the emitter and the base of the second transistor Q2 are equipotential points. The fourth resistor R4 does not provide a bias voltage to the emitter junction of the second transistor Q2, and the second transistor Q2 cannot be turned on; when the first shielding conductor structure 221 is located between the second end b and the third end c and the part is open, or when the second shielding conductor structure 222 is located between the sixth end f and the fifth end e and the part is open, or when the connecting conductor between the third end c and the sixth end f is disconnected, the two ends of the fourth resistor R4 will no longer be short-circuited and can bear voltage division, thereby providing a bias voltage to the emitter junction of the second transistor Q2 to turn on the second transistor Q2.

[0097] It should be noted that Figure 2The trigger module 240 shown further includes a trip coil Lx and a first diode D1, wherein the end of the fifth resistor R5 connected to the second current-carrying line 120 is not directly connected to the second current-carrying line 120, but is connected to the second current-carrying line 120 via the trip coil Lx. It is understood that in some other embodiments, the end of the fifth resistor R5 connected to the second current-carrying line 120 can also be directly connected to the second current-carrying line 120 without being connected to the second current-carrying line 120 via the trip coil Lx. Similarly, the end of the sixth resistor R6 connected to the first current-carrying line 110 is not directly connected to the first current-carrying line 110, but is connected to the first current-carrying line 110 via the first diode D1. It is understood that in some other embodiments, the end of the sixth resistor R6 connected to the first current-carrying line 110 can also be directly connected to the first current-carrying line 110 without being connected to the first current-carrying line 110 via the first diode D1.

[0098] In addition, it is understandable that Figure 2 In the embodiment, one end of the second resistor R2 and one end of the fifth resistor R5 are connected together and then connected to the second current-carrying line 120 via the tripping coil Lx, and one end of the third resistor R3 and one end of the sixth resistor R6 are connected to the first current-carrying line 110 via the first diode D1. In some other embodiments, one end of the second resistor R2 and one end of the fifth resistor R5 are connected together and then changed to be connected to the first current-carrying line 110 via the tripping coil Lx, and one end of the third resistor R3 and one end of the sixth resistor R6 are changed to be connected to the second current-carrying line 120 via the first diode D1.

[0099] In the utility model and Figure 2 In another embodiment different from the embodiment shown, the open circuit detection module 230 includes a first switch unit 231 and a second switch unit 232; the trigger module 240 includes a trip coil Lx and a first diode D1;

[0100] One end of the first switch unit 231 is connected to the first current-carrying line 110 or the second current-carrying line 120, and the other end is connected to the trigger module 240. The open circuit detection module 230 also includes a first bias unit for providing a switch-on signal to the first switch unit 231. One end of the first bias unit is connected to the first end a, and the other end is connected to the fifth end e. Specifically, refer to Figure 3, the first switch unit 231 includes a first transistor Q1, the first bias unit includes a first resistor R1, the first switch unit 231 also includes a second resistor R2 and a third resistor R3, one end of the second resistor R2 is connected to the second current-carrying line 120 via the tripping coil Lx, the other end of the second resistor R2 is connected to one end of the first resistor R1, the emitter of the first transistor Q1 and the first end a, the other end of the first resistor R1 is connected to one end of the third resistor R3, the base of the first transistor Q1 and the fifth end e, the collector of the first transistor Q1 is connected to the trigger module 240, and the other end of the third resistor R3 is connected to the first current-carrying line 110 via the first diode D1;

[0101] One end of the second switch unit 232 is connected to the first current-carrying line 110 or the second current-carrying line 120, and the other end is connected to the trigger module 240. The open circuit detection module 230 also includes a second bias unit for providing a conduction switch signal for the second switch unit 232. One end of the second bias unit is connected to the second end b, and the other end is connected to the fourth end d. Specifically, the second switch unit 232 includes a second triode Q2, the second bias unit includes a fourth resistor R4, and the second switch unit 232 also includes a fifth resistor R5 and a sixth resistor R6. One end of the fifth resistor R5 is connected to the second current-carrying line 120 via a tripping coil Lx, and the other end of the fifth resistor R5 is connected to one end of the fourth resistor R4, the emitter of the second triode Q2, and the second end b. The other end of the fourth resistor R4 is connected to one end of the sixth resistor R6, the base of the second triode Q2, and the fourth end d. The collector of the second triode Q2 is connected to the trigger module 240, and the other end of the sixth resistor R6 is connected to the first current-carrying line 110 via a first diode D1.

[0102] Understandably, Figure 3 The embodiment shown is Figure 2 The principles of the embodiments shown are the same, except that Figure 3 In the figure, the two ends of the first resistor R1 are short-circuited by the portion of the first shielding conductor structure 221 located between the first end a and the third end c, the connecting conductor between the third end c and the sixth end f, and the portion of the second shielding conductor structure 222 located between the sixth end f and the fifth end d; the two ends of the fourth resistor R4 are short-circuited by the portion of the first shielding conductor structure 221 located between the second end b and the third end c, the connecting conductor between the third end c and the sixth end f, and the portion of the second shielding conductor structure 222 located between the sixth end f and the fourth end d.

[0103] In the detection protection device provided in some embodiments of the present invention, the trigger module 240 includes a tripping coil Lx for generating electromagnetic force to drive the switch module 210 to disconnect the power connection, and the tripping coil Lx and the third switch unit 241 are connected in series between the first current-carrying line 110 and the second current-carrying line 120. Specifically, referring to Figure 2 , the third switch unit 241 includes a thyristor Q3, the trigger module 240 also includes a seventh resistor R7, the control electrode of the thyristor Q3 is respectively connected to one end of the seventh resistor R7, the positive electrode of the voltage stabilizing unit ZD1 and the open circuit detection module 230, the other end of the seventh resistor R7 is connected to the cathode of the thyristor Q3 and connected to the first current-carrying line 110 via the first diode D1, and the anode of the thyristor Q3 is connected to the second current-carrying line 120 via the tripping coil Lx. The trigger module 240 may also include a tenth resistor R10, one end of the seventh resistor R7 is connected to the control electrode of the thyristor Q3 and then connected to the collector of the first transistor Q1 and the collector of the second transistor Q2 of the open circuit detection module 230 via the tenth resistor R10.

[0104] It should be noted that when one end of the seventh resistor R7 connected to the control electrode of the thyristor Q3 receives an open circuit signal or a leakage signal, a voltage will be generated at both ends of the seventh resistor R7 and provided to the base and cathode of the thyristor Q3, that is, a switch-on signal is provided to the thyristor Q3, so that the thyristor Q3 is turned on, and then the trip coil Lx is energized to generate electromagnetic force to drive the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0105] Reference Figure 2 In the detection and protection device provided in some embodiments of the present utility model, the trigger module 240 further includes a first capacitor C1 connected in parallel with the seventh resistor R7.

[0106] It can be understood that when the first current-carrying line 110 is the live line L and the second current-carrying line 120 is the neutral line N, even if the end of the seventh resistor R7 connected to the control electrode of the thyristor Q3 receives an open-circuit signal or a leakage signal, the thyristor Q3 needs to be turned on in the negative half cycle of the AC power supply. Therefore, a first capacitor C1 is set in parallel with the seventh resistor R7. When an open-circuit signal or a leakage signal is received in the positive half cycle of the AC power supply, the first capacitor C1 can be charged, thereby increasing the potential of the control electrode of the thyristor Q3, and the thyristor Q3 can be triggered to turn on in the negative half cycle of the AC power supply.

[0107] Reference Figure 2 In the detection and protection device provided in some embodiments of the present utility model, the trigger module 240 also includes a first diode D1 and a second diode D2, the other end of the seventh resistor R7 and the cathode of the thyristor Q3 are connected to the anode of the first diode D1 and the anode of the second diode D2, the cathode of the first diode D1 is connected to the first current-carrying line 110, and the cathode of the second diode D2 is connected to the connection point between the thyristor Q3 and the tripping coil Lx.

[0108] Reference Figure 2In some embodiments of the present invention, the detection and protection device further includes a leakage simulation module 250, which includes a first test switch TEST1, one end of which is connected to the second current-carrying line 120, and the other end of which is connected to the first shielding conductor structure 221 and / or the second shielding conductor structure 222. Preferably, the other end of the first test switch TEST1 is connected to one of the first end a, the second end b, the third end c, the fourth end d, the fifth end e and the sixth end f.

[0109] It can be understood that when the first test switch TEST1 is pressed, the first test switch TEST1 connects the second current-carrying line 120 to the first shielding conductor structure 221 or the second shielding conductor structure 222, that is, the leakage signal of the simulated second current-carrying line 120 is transmitted to the first shielding conductor structure 221 or the second shielding conductor structure 222, thereby testing whether the leakage detection function of the detection protection device is intact.

[0110] It is also understandable that in Figure 2 In the embodiment, one end of the first test switch TEST1 is not directly connected to the second current-carrying line 120, but is connected to the second current-carrying line 120 via the trip coil Lx. In some other embodiments, one end of the first test switch TEST1 may also be changed to be directly connected to the second current-carrying line 120.

[0111] In addition, one end of the first test switch TEST1 may also be directly or indirectly connected to the first current-carrying line 110 instead of being connected to the second current-carrying line 120 .

[0112] Reference Figure 3 and Figure 4 In the detection and protection device provided in some embodiments of the present invention, the leakage simulation module 250 includes not only the first test switch TEST1, but also an eighth resistor R8 and a ninth resistor R9. One end of the first test switch TEST1 is connected to the second current-carrying line 120, and the other end of the first test switch TEST1 is respectively connected to one end of the eighth resistor R8 and one end of the ninth resistor R9, and the other end of the eighth resistor R8 and the other end of the ninth resistor R9 are respectively connected to two of the first end a, the second end b, the third end c, the fourth end d, the fifth end e and the sixth end f.

[0113] It is understandable that when the first test switch TEST1 is pressed, the leakage signal of the second current-carrying line 120 can be simulated and transmitted to two locations in the first shielding conductor structure 221 and the second shielding conductor structure 222, thereby testing whether the leakage detection function of the detection protection device is intact.

[0114] Similarly, in Figure 4In the illustrated embodiment, one end of the first test switch TEST1 may also be directly or indirectly connected to the first current-carrying line 110 instead of being connected to the second current-carrying line 120 .

[0115] Reference Figure 5 In some embodiments of the present invention, the detection and protection device further includes a second test switch TEST2, one end of which is connected to the second current-carrying line 120, and the other end is connected to the control pin of the third switch unit 241, that is, connected to the control electrode of the thyristor Q3.

[0116] When the second test switch TEST2 is pressed, the second current-carrying line 120 directly provides a conduction control signal to the control electrode of the thyristor Q3, and the analog trigger module 240 receives a leakage signal or an open circuit signal, thereby testing whether the trigger module 240 and the switch module 210 can work normally.

[0117] Reference Figure 6 In some embodiments of the present invention, the detection and protection device provided by the present invention further includes a leakage simulation module 250, the leakage simulation module 250 includes a third test switch TEST3 and a fourteenth resistor R14, one end of the third test switch TEST3 is connected to the second current-carrying line 120, and the other end is connected to the first shielding conductor structure 221 and / or the second shielding conductor structure 222 through the fourteenth resistor R14, the fourteenth resistor R14 is configured as: when the third test switch TEST3 is pressed and the open circuit detection module 230 fails, the potential of the negative electrode of the voltage stabilizing unit ZD1 is adjusted to prevent the voltage stabilizing unit ZD1 from being broken down.

[0118] In this embodiment, for the voltage stabilizing unit ZD1, its positive electrode is connected to the control electrode of the thyristor Q3, and its negative electrode is connected to any one of the first end a, the second end b, the third end c, the fourth end d, the fifth end e, and the sixth end f through the eleventh resistor R11. When the first shielding conductor structure 221 and the second shielding conductor structure 222 in the leakage detection module 220 are not open-circuited, the first end a, the second end b, the third end c, the fourth end d, the fifth end e, and the sixth end f are all equipotential points, and their potentials are determined by the series voltage division of the first equivalent resistance after the second resistor R2 and the fifth resistor R5 are connected in parallel and the second equivalent resistance after the third resistor R3 and the sixth resistor R6 are connected in parallel. When the first shielding conductor structure 221 and the second shielding conductor structure 222 are not open-circuited, the voltage division is at a normal level and will not cause the voltage stabilizing unit ZD1 to be broken down. When the third test switch TEST3 is pressed, it is equivalent to connecting the fourteenth resistor R14 in parallel with the second resistor R2 and the fifth resistor R5, so that the first equivalent resistance becomes smaller, resulting in the increase of the potential of the first shielding conductor structure 221 and the second shielding conductor structure 222, which will cause the voltage stabilizing unit ZD1 to be broken down, thereby increasing the voltage of the control electrode of the thyristor Q3. When the negative half cycle of the AC power supply comes, that is, the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120-tripping coil Lx-thyristor Q3-first diode D1-first current-carrying line 110; the tripping coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line. When the open circuit detection module 230 has an open circuit fault in the second resistor R2 or the fifth resistor R5, the first equivalent resistor will increase, and the potential of the first shielded conductor structure 221 and the second shielded conductor structure 222 will decrease. At this time, pressing the third test switch TEST3 will cause the potential of the first shielded conductor structure 221 and the second shielded conductor structure 222 to rise again. However, by reasonably configuring the resistance value of the fourteenth resistor R14, the degree of the potential rise of the first shielded conductor structure 221 and the second shielded conductor structure 222 will not be too large, and pressing the third test switch TEST3 is not enough to break down the voltage stabilizing unit ZD1. Therefore, when the open circuit detection module 230 fails, the user presses the third test switch TEST3 for testing, the voltage stabilizing unit ZD1 is not broken down, and the tripping coil Lx will not drive the switch module 210 to disconnect the power connection. At this time, the user can determine that the detection protection device is abnormal.

[0119] It is also understandable that in Figure 6In the embodiment of the present invention, one end of the third test switch TEST3 is not directly connected to the second current-carrying line 120, but is connected to the second current-carrying line 120 via the tripping coil Lx. In some other embodiments, one end of the third test switch TEST3 can also be changed to be directly connected to the second current-carrying line 120. In addition, one end of the third test switch TEST3 can also be directly or indirectly connected to the first current-carrying line 110 instead of being connected to the second current-carrying line 120.

[0120] In addition, Figures 2 to 6 In the embodiment shown, the detection and protection device further includes an LED indicating unit 260 connected in parallel with the thyristor Q3, and the LED indicating unit 260 includes a twelfth resistor R12, a thirteenth resistor R13 and a light emitting diode LED1 connected in series. The connection point between the thyristor Q3 and the tripping coil Lx is connected to one end of the thirteenth resistor R13, the other end of the thirteenth resistor R13 is connected to one end of the twelfth resistor R12, the other end of the twelfth resistor R12 is connected to the positive electrode of the light emitting diode LED1, the negative electrode of the light emitting diode LED1 is connected to the positive electrode of the first diode D1, and the negative electrode of the first diode D1 is connected to the first current carrying line 110.

[0121] In addition, it can be seen that the detection and protection device also includes a lightning protection unit 270, which includes a first varistor ZR1 arranged between the first current-carrying line 110 and the second current-carrying line 120; the trigger module 240 also includes a second varistor ZR2 connected in parallel with the thyristor Q3. It can be understood that the varistor is a resistor device with nonlinear volt-ampere characteristics, which is mainly used to clamp the voltage when the circuit is subjected to overvoltage and absorb excess current to protect sensitive devices.

[0122] Below, Figure 2 The embodiment shown introduces the operation of the detection protection device provided by the embodiment of the utility model under various leakage and open circuit conditions:

[0123] 1. When the leakage signal of the first current-carrying line 110 is transmitted to the first shielding conductor structure 221:

[0124] After the first shielding conductor structure 221 obtains the leakage signal, the voltage stabilizing unit ZD1 is broken down, forming a conducting path of the first current-carrying line 110 - the first shielding conductor structure 221 - the eleventh resistor R11 - the voltage stabilizing unit ZD1 - the seventh resistor R7 - the second diode D2 - the tripping coil Lx - the second current-carrying line 120;

[0125] The voltage of the control electrode of the thyristor Q3 increases, and when the negative half cycle of the AC power source comes, that is, the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120-tripping coil Lx-thyristor Q3-first diode D1-first current-carrying line 110;

[0126] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0127] 2. When the leakage signal of the second current-carrying line 120 is transmitted to the second shielding conductor structure 222:

[0128] After the second shielding conductor structure 222 obtains the leakage signal, the voltage stabilizing unit ZD1 is broken down, forming a conducting path of the second current-carrying line 120 - the second shielding conductor structure 222 - the eleventh resistor R11 - the voltage stabilizing unit ZD1 - the seventh resistor R7 - the first diode D1 - the first current-carrying line 110;

[0129] The voltage of the control electrode of the thyristor Q3 increases, and when the negative half cycle of the AC power source comes, that is, the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120-tripping coil Lx-thyristor Q3-first diode D1-first current-carrying line 110;

[0130] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0131] 3. When the first shielding conductor structure 221 is located between the first end a and the third end c and is open:

[0132] The short-circuit path between the first end a and the fourth end d is disconnected, and the two ends of the first resistor R1 are no longer short-circuited; the two ends of the fourth resistor R4 are still short-circuited. Figure 7 As shown by the arrow in, the fourth resistor R4 is short-circuited by the conduction path of the second end b-the third end c-the sixth end f-the fifth end e; it should be noted that the conduction path of the second end b-the third end c-the sixth end f-the fourth end d exists at the same time;

[0133] Forming a conducting path of the second current-carrying line 120 - tripping coil Lx - second resistor R2 - first resistor R1 - third resistor R3 - first diode D1 - first current-carrying line 110;

[0134] The first transistor Q1 is turned on, and the second transistor Q2 is kept turned off; forming a conduction path of the second current-carrying line 120-tripping coil Lx-second resistor R2-first transistor Q1-tenth resistor R10-seventh resistor R7-first diode D1-first current-carrying line 110;

[0135] The voltage of the control electrode of the thyristor Q3 increases, and when the negative half cycle of the AC power source comes, that is, the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120-tripping coil Lx-thyristor Q3-first diode D1-first current-carrying line 110;

[0136] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0137] 4. When the first shielding conductor structure 221 is located between the second end b and the third end c and is open:

[0138] The short-circuit path between the second end b and the fifth end e is disconnected, and the two ends of the fourth resistor R4 are no longer short-circuited; the two ends of the first resistor R1 are still short-circuited. Figure 8 As shown by the arrow in the figure, the first resistor R1 is short-circuited by the conductive path of the first end a-the third end c-the sixth end f-the fourth end d; it should be noted that the conductive path of the first end a-the third end c-the sixth end f-the fifth end e exists at the same time;

[0139] Forming a conducting path of the second current-carrying line 120 - tripping coil Lx - fifth resistor R5 - fourth resistor R4 - sixth resistor R6 - first diode D1 - first current-carrying line 110;

[0140] The second transistor Q2 is turned on, and the first transistor Q1 is kept turned off; forming a conduction path of the second current-carrying line 120-tripping coil Lx-fifth resistor R5-second transistor Q2-tenth resistor R10-seventh resistor R7-first diode D1-first current-carrying line 110;

[0141] The voltage of the control electrode of the thyristor Q3 increases, and when the negative half cycle of the AC power source comes, that is, the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120-tripping coil Lx-thyristor Q3-first diode D1-first current-carrying line 110;

[0142] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0143] 5. When the connecting conductor between the third terminal c and the sixth terminal f is open:

[0144] The short-circuit path between the first end a and the fourth end d is disconnected, and the two ends of the first resistor R1 are no longer short-circuited; the short-circuit path between the second end b and the fifth end e is disconnected, and the two ends of the fourth resistor R4 are no longer short-circuited. Fig. 9 As shown;

[0145] Forming a conducting path of the second current-carrying line 120-tripping coil Lx-second resistor R2-first resistor R1-third resistor R3-first diode D1-first current-carrying line 110, and forming a conducting path of the second current-carrying line 120-tripping coil Lx-fifth resistor R5-fourth resistor R4-sixth resistor R6-first diode D1-first current-carrying line 110;

[0146] The first transistor Q1 and the second transistor Q2 are both turned on; forming a conduction path of the second current-carrying line 120-tripping coil Lx-second resistor R2-first transistor Q1-tenth resistor R10-seventh resistor R7-first diode D1-first current-carrying line 110, and forming a conduction path of the second current-carrying line 120-tripping coil Lx-fifth resistor R5-second transistor Q2-tenth resistor R10-seventh resistor R7-first diode D1-first current-carrying line 110;

[0147] The voltage of the control electrode of the thyristor Q3 increases, and when the negative half cycle of the AC power source comes, that is, the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120-tripping coil Lx-thyristor Q3-first diode D1-first current-carrying line 110;

[0148] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0149] 6. When the portion of the second shielding conductor structure 222 between the fourth end d and the sixth end f is open:

[0150] The short-circuit path between the first end a and the fourth end d is disconnected, and the two ends of the first resistor R1 are no longer short-circuited; the two ends of the fourth resistor R4 are still short-circuited. Fig.10 As shown by the arrow in the figure, the fourth resistor R4 is short-circuited by the conduction path of the second end b-the third end c-the sixth end f-the fifth end e; it should be noted that the conduction path of the first end a-the third end c-the sixth end f-the fifth end e exists at the same time;

[0151] Forming a conducting path of the second current-carrying line 120 - tripping coil Lx - second resistor R2 - first resistor R1 - third resistor R3 - first diode D1 - first current-carrying line 110;

[0152] The first transistor Q1 is turned on, and the second transistor Q2 is kept turned off; forming a conduction path of the second current-carrying line 120-tripping coil Lx-second resistor R2-first transistor Q1-tenth resistor R10-seventh resistor R7-first diode D1-first current-carrying line 110;

[0153] The voltage of the control electrode of the thyristor Q3 increases, and when the negative half cycle of the AC power source comes, that is, the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120-tripping coil Lx-thyristor Q3-first diode D1-first current-carrying line 110;

[0154] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0155] 7. When the portion of the second shielding conductor structure 222 between the fifth end e and the sixth end f is open:

[0156] The short-circuit path between the second end b and the fifth end e is disconnected, and the two ends of the fourth resistor R4 are no longer short-circuited; the two ends of the first resistor R1 are still short-circuited. Fig.11 As shown by the arrow in the figure, the first resistor R1 is short-circuited by the conductive path of the first end a-the third end c-the sixth end f-the fourth end d; it should be noted that the conductive path of the second end b-the third end c-the sixth end f-the fourth end d exists at the same time;

[0157] Forming a conducting path of the second current-carrying line 120 - tripping coil Lx - fifth resistor R5 - fourth resistor R4 - sixth resistor R6 - first diode D1 - first current-carrying line 110;

[0158] The second transistor Q2 is turned on, and the first transistor Q1 is kept turned off; forming a conduction path of the second current-carrying line 120-tripping coil Lx-fifth resistor R5-second transistor Q2-tenth resistor R10-seventh resistor R7-first diode D1-first current-carrying line 110;

[0159] The voltage of the control electrode of the thyristor Q3 increases, and when the negative half cycle of the AC power source comes, that is, the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120-tripping coil Lx-thyristor Q3-first diode D1-first current-carrying line 110;

[0160] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0161] 8. When the first test switch TEST1 is pressed:

[0162] The first test switch TEST1 simulates the leakage signal of the second current-carrying line 120 and transmits it to the first shielding conductor structure 221 or the second shielding conductor structure 222 ;

[0163] After the first shielding conductor structure 221 or the second shielding conductor structure 222 obtains the leakage signal, the voltage stabilizing unit ZD1 is broken down, forming a conducting path of the second current-carrying line 120-tripping coil Lx-first test switch TEST1-first shielding conductor structure 221 / second shielding conductor structure 222-voltage stabilizing unit ZD1-seventh resistor R7-first diode D1-first current-carrying line 110;

[0164] The voltage of the control electrode of the thyristor Q3 increases, and when the negative half cycle of the AC power source comes, that is, the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120-tripping coil Lx-thyristor Q3-first diode D1-first current-carrying line 110;

[0165] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0166] Reference Fig.12 Another embodiment of the utility model further provides a detection protection device, compared with Figure 2 The embodiment shown is different in that the control pin of the third switch unit 241 in the trigger module 240 obtains the open circuit signal through the voltage stabilizing unit ZD1. Specifically, the collector of the first transistor Q1 and the collector of the second transistor Q2 are connected together and connected to one end of the tenth resistor R10, the other end of the tenth resistor R10 is connected to one end of the eleventh resistor R11 and the negative electrode of the voltage stabilizing unit ZD1, and the other end of the eleventh resistor R11 is connected to one of the first end a, the second end b, the third end c, the fourth end d, the fifth end e and the sixth end f.

[0167] It is understandable that, with such a configuration, the open circuit signal generated by the open circuit detection module 230 is not directly transmitted to the trigger module 240, but is first transmitted to the voltage stabilizing unit ZD1 and then to the trigger module 240, and the open circuit signal generated by the open circuit detection module 230 can be separated from the leakage detection module 210 by the eleventh resistor R11.

[0168] Reference Fig.13 In the detection and protection device provided in some embodiments of the present utility model, Figure 6 Compared with the detection and protection device shown in FIG. 1 , the device has the same switch module 210, leakage detection module 220, leakage simulation module 250, LED indication unit 260 and lightning protection unit 270. Figure 6The open circuit detection module 230 and the trigger module 240 in the detection protection device shown have been modified, specifically:

[0169] The first switch unit 231 includes a first transistor Q1, and the first bias unit includes a first resistor R1 and a twelfth resistor R12; the second switch unit 232 includes a second transistor Q2, and the second bias unit includes a fourth resistor R4 and a thirteenth resistor R13;

[0170] The open circuit detection module 230 further includes a second resistor R2, a third resistor R3, a fifth resistor R5 and a sixth resistor R6;

[0171] The emitter of the first transistor Q1 is connected to one end of the first resistor R1, the first end a and one end of the second resistor R2, the base of the first transistor Q1 is connected to the other end of the first resistor R1 and one end of the twelfth resistor R12, and the other end of the twelfth resistor R12 is connected to the fourth end d and one end of the third resistor R3;

[0172] The emitter of the second triode Q2 is connected to one end of the fourth resistor R4, the second end b and one end of the fifth resistor R5, the base of the second triode Q2 is connected to the other end of the fourth resistor R4 and one end of the thirteenth resistor R13, and the other end of the thirteenth resistor R13 is connected to the fifth end e and one end of the sixth resistor R6;

[0173] The other end of the second resistor R2 is connected to the other end of the fifth resistor R5 and connected to one of the first current-carrying line 110 and the second current-carrying line 120, the other end of the third resistor R3 is connected to the other end of the sixth resistor R6 and connected to the other of the first current-carrying line 110 and the second current-carrying line 120, and the collector of the first transistor Q1 is connected to the collector of the second transistor Q2 and connected to the trigger module 240.

[0174] Similarly, in the present embodiment, since the two ends of the first bias unit (the first resistor R1, the twelfth resistor R12) are respectively connected to the first end a and the fourth end d, and the first end a and the fourth end d are short-circuited by the portion of the first shielding conductor structure 221 located between the first end a and the third end c, the connecting conductor between the third end c and the sixth end f, and the portion of the second shielding conductor structure 222 located between the sixth end f and the fourth end d, the two ends of the first bias unit are short-circuited, and the switch-on signal cannot be provided to the first transistor Q1; similarly, since the two ends of the second bias unit (the fourth resistor R4, the thirteenth resistor R13) are respectively connected to the second end b and the fifth end e, and the second end b and the fifth end e are short-circuited by the portion of the first shielding conductor structure 221 located between the second end b and the third end c, the connecting conductor between the third end c and the sixth end f, and the portion of the second shielding conductor structure 222 located between the sixth end f and the fifth end e, the two ends of the second bias unit are short-circuited, and the switch-on signal cannot be provided to the second transistor Q2.

[0175] In addition, when any part of the first shielding conductor structure 221 and the second shielding conductor structure 222 between the first end a and the fourth end d is open-circuited, that is, when the part of the first shielding conductor structure 221 between the first end a and the third end c is open-circuited, or when the part of the second shielding conductor structure 222 between the sixth end f and the fourth end d is open-circuited, the two ends of the first bias unit will no longer be short-circuited, and the first resistor R1 and the twelfth resistor R12 can bear the voltage division, and the voltage division across the first resistor R1 is equivalent to providing a bias voltage to the emitter junction of the first transistor Q1 to turn on the first transistor Q1, and then sending an open-circuit signal to the trigger module 240 under the action of the electric energy provided by the first current-carrying line 110 or the second current-carrying line 120; Similarly, when any part of the first shielding conductor structure 221 and the second shielding conductor structure 222 between the second end b and the fifth end e is open-circuited, that is, when the part of the first shielding conductor structure 221 between the second end b and the third end c is open-circuited, or when the part of the second shielding conductor structure 222 between the sixth end f and the fifth end e is open-circuited, the two ends of the second bias unit will no longer be short-circuited, and the fourth resistor R4 and the thirteenth resistor R13 can bear the voltage division, and the voltage division across the four resistors R4 is equivalent to providing a bias voltage to the emitter junction of the second transistor Q2 to turn on the second transistor Q2, and then send an open-circuit signal to the trigger module 240 under the action of the electric energy provided by the first current-carrying line 110 or the second current-carrying line 120. It should also be noted that when the connecting conductor between the third end c and the sixth end f is disconnected, the first end a and the fourth end d, and the second end b and the fifth end e are no longer short-circuited, that is, both ends of the first bias unit and both ends of the second bias unit are no longer short-circuited, so that the switch conduction signal can be provided to the first transistor Q1 and the second transistor Q2 at the same time, thereby causing the first transistor Q1 and the second transistor Q2 to send an open circuit signal to the trigger module 240 at the same time.

[0176] Reference Fig.13 In the detection and protection device provided in some embodiments of the present invention, the trigger module 240 includes a voltage stabilizing unit ZD1 and a third switch unit 241 that drives the switch module 210 to disconnect the power connection when turned on. The control pin of the third switch unit 241 is connected to the collector of the first transistor Q1 and the collector of the second transistor Q2 to obtain an open circuit signal; the negative electrode of the voltage stabilizing unit ZD1 is connected to the first shielding conductor structure 221 and / or the second shielding conductor structure 222 to obtain a leakage signal in the first shielding conductor structure 221 and / or the second shielding conductor structure 222, and the positive electrode of the voltage stabilizing unit ZD1 is connected to the control pin of the third switch unit 241.

[0177] It can be understood that since the first shielding conductor structure 221 and the second shielding conductor structure 222 have been connected together through the third end c of the first shielding conductor structure 221 and the sixth end f of the second shielding conductor structure 222, therefore, when there is no short circuit between the first shielding conductor structure 221, the second shielding conductor structure 222 and the connecting conductor between the third end c and the sixth end f, the negative electrode of the voltage stabilizing unit ZD1 only needs to be connected to any point in the first shielding conductor structure 221 and the second shielding conductor structure 222, and the leakage signal detected at any other position of the first shielding conductor structure 221 and the second shielding conductor structure 222 can be transmitted to the negative electrode of the voltage stabilizing unit ZD1.

[0178] It should be noted that the control pin of the third switch unit 241 can be directly connected to the open circuit detection module 230 to obtain the open circuit signal, or can be indirectly connected to the open circuit detection module 230, for example, referring to Fig.13 As shown, the trigger module 240 also includes a tenth resistor R10, and the control pin of the third switch unit 241 is indirectly connected to the open circuit detection module 230 through the tenth resistor R10, that is, the control pin of the third switch unit 241 is connected to one end of the tenth resistor R10, and the other end of the tenth resistor R10 is connected to the collector of the first transistor Q1 and the collector of the second transistor Q2; similarly, the negative electrode of the voltage stabilizing unit ZD1 can be directly connected to the first shielding conductor structure 221 and / or the second shielding conductor structure 222, and can also be indirectly connected to the first shielding conductor structure 221 and / or the second shielding conductor structure 222, for example, referring to Fig.13 As shown, the trigger module 240 also includes an eleventh resistor R11, and the negative electrode of the voltage stabilizing unit ZD1 is connected to the first shielding conductor structure 221 and / or the second shielding conductor structure 222 through the eleventh resistor R11, that is, the negative electrode of the voltage stabilizing unit ZD1 is connected to one end of the eleventh resistor R11, and the other end of the eleventh resistor R11 is connected to any one of the first end a, the second end b, the third end c, the fourth end d, the fifth end e, and the sixth end f; in addition, the positive electrode of the voltage stabilizing unit ZD1 can be directly connected to the control pin of the third switch unit 241, and can also be indirectly connected to the control pin of the third switch unit 241, for example, referring to Fig.13 As shown, the positive electrode of the voltage stabilizing unit ZD1 is connected to the control pin of the third switch unit 241 via the tenth resistor R10.

[0179] Reference Fig.13In some embodiments of the present invention, the detection and protection device further includes a leakage simulation module 250, which includes a third test switch TEST3, one end of which is connected to the connection point between the second resistor R2 and the fifth resistor R5, and the other end of which is connected to the first shielding conductor structure 221 and / or the second shielding conductor structure 222. Preferably, the other end of the third test switch TEST3 is connected to one of the first end a, the second end b, the third end c, the fourth end d, the fifth end e and the sixth end f.

[0180] It is understandable that when the third test switch TEST3 is pressed, the third test switch TEST3 connects the second current-carrying line 120 to the first shielding conductor structure 221 or the second shielding conductor structure 222, that is, the leakage signal of the simulated second current-carrying line 120 is transmitted to the first shielding conductor structure 221 or the second shielding conductor structure 222, so as to test whether the leakage detection function of the detection protection device is intact. It is also understandable that when Fig.13 In the embodiment of the present invention, one end of the third test switch TEST3 is not directly connected to the second current-carrying line 120, but is connected to the second current-carrying line 120 via the tripping coil Lx. In some other embodiments, one end of the third test switch TEST3 can also be changed to be directly connected to the second current-carrying line 120. In addition, one end of the third test switch TEST3 can also be directly or indirectly connected to the first current-carrying line 110 instead of being connected to the second current-carrying line 120.

[0181] Reference Fig.13 In the detection protection device provided in some embodiments of the present invention, the leakage simulation module 250 also includes a fourteenth resistor R14, the other end of the third test switch TEST3 is connected to one end of the fourteenth resistor R14, and the other end of the fourteenth resistor R14 is connected to one of the first end a, the second end b, the third end c, the fourth end d, the fifth end e and the sixth end f; the negative electrode of the voltage stabilizing unit ZD1 is connected to one of the first end a, the second end b, the third end c, the fourth end d, the fifth end e and the sixth end f; the fourteenth resistor R14 is configured as: when the third test switch TEST3 is pressed and the open circuit detection module 230 fails, the potential of the negative electrode of the voltage stabilizing unit ZD1 is adjusted to prevent the voltage stabilizing unit ZD1 from being broken down.

[0182] In this embodiment, for the voltage stabilizing unit ZD1, its positive electrode is connected to the control electrode of the thyristor Q3 through the tenth resistor R10, and its negative electrode is connected to any one of the first end a, the second end b, the third end c, the fourth end d, the fifth end e, and the sixth end f through the eleventh resistor R11. When the first shielding conductor structure 221 and the second shielding conductor structure 222 in the leakage detection module 220 are not open-circuited, the first end a, the second end b, the third end c, the fourth end d, the fifth end e, and the sixth end f are all equipotential points, and their potentials are determined by the series voltage division of the first equivalent resistance after the second resistor R2 and the fifth resistor R5 are connected in parallel and the second equivalent resistance after the third resistor R3 and the sixth resistor R6 are connected in parallel. When the first shielding conductor structure 221 and the second shielding conductor structure 222 are not open-circuited, the voltage division is at a normal level and will not cause the voltage stabilizing unit ZD1 to be broken down. When the third test switch TEST3 is pressed, it is equivalent to connecting the fourteenth resistor R14 in parallel with the second resistor R2 and the fifth resistor R5, so that the first equivalent resistance becomes smaller, resulting in the increase of the potential of the first shielding conductor structure 221 and the second shielding conductor structure 222, which will cause the voltage stabilizing unit ZD1 to be broken down, thereby increasing the voltage of the control electrode of the thyristor Q3. When the negative half cycle of the AC power supply comes, that is, the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120-tripping coil Lx-thyristor Q3-first diode D1-first current-carrying line 110; the tripping coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line. Exemplarily, when the open circuit detection module 230 has an open circuit fault in the second resistor R2 or the fifth resistor R5, the first equivalent resistor will increase, and the potential of the first shielded conductor structure 221 and the second shielded conductor structure 222 will decrease. At this time, pressing the third test switch TEST3 will cause the potential of the first shielded conductor structure 221 and the second shielded conductor structure 222 to rise again. However, by reasonably configuring the resistance value of the fourteenth resistor R14, the degree of the potential rise of the first shielded conductor structure 221 and the second shielded conductor structure 222 will not be too large, and pressing the third test switch TEST3 is not enough to cause the voltage stabilizing unit ZD1 to be broken down. Therefore, when the open circuit detection module 230 fails, the user presses the third test switch TEST3 for testing, the voltage stabilizing unit ZD1 is not broken down, and the tripping coil Lx will not drive the switch module 210 to disconnect the power connection. At this time, the user can determine that the detection protection device is abnormal.

[0183] Reference Fig.14In a power line detection protection device provided in a specific embodiment of the utility model: the power line includes a first current-carrying line 110 and a second current-carrying line 120; the detection protection device includes a switch module 210, a leakage detection module 220, an open circuit detection module 230, a trigger module 240 and a leakage simulation module 250; specifically:

[0184] The switch module 210 is used to control the power connection between the input end and the output end of the power line;

[0185] The leakage detection module 220 includes a first shielded conductor structure 221 covering the first current-carrying line 110 and a second shielded conductor structure 222 covering the second current-carrying line 120; the first shielded conductor structure 221 is used to collect the leakage signal of the first current-carrying line 110, and the second shielded conductor structure 222 is used to collect the leakage signal of the second current-carrying line 120; the first shielded conductor structure 221 includes a first end a close to the input end of the power line, a second end b close to the output end of the power line, and a third end c located between the first end a and the second end b; the second shielded conductor structure 222 includes a fourth end d close to the input end, a fifth end e close to the output end, and a sixth end f located between the fourth end d and the fifth end e; the third end c is connected to the sixth end f;

[0186] The open circuit detection module 230 is respectively connected to the first end a, the second end b, the fourth end d and the fifth end e. The open circuit detection module 230 is configured to generate an open circuit signal when at least a portion of the first shielding conductor structure 221 and / or the second shielding conductor structure 222 is open circuited; the open circuit detection module 230 includes a first triode Q1, a first voltage dividing unit 233, a second triode Q2 and a second voltage dividing unit 234; the first voltage dividing unit 233 includes a second resistor R2, a first resistor R1, a twelfth resistor R12 and a third resistor R3 connected in series in sequence, and the second voltage dividing unit 234 includes a fifth resistor R5, a fourth resistor R4, a thirteenth resistor R13 and a sixth resistor R6 connected in series in sequence; the second resistor R2 and the first resistor R 1 is connected to the first terminal a and the emitter of the first transistor Q1; the connection point of the first resistor R1 and the twelfth resistor R12 is connected to the base of the first transistor Q1; the connection point of the twelfth resistor R12 and the third resistor R3 is connected to the fourth terminal d; the connection point of the fifth resistor R5 and the fourth resistor R4 is connected to the second terminal b and the emitter of the second transistor Q2; the connection point of the fourth resistor R4 and the thirteenth resistor R13 is connected to the base of the second transistor Q2; the connection point of the thirteenth resistor R13 and the sixth resistor R6 is connected to the fifth terminal e; the second resistor R2 and the fifth resistor R5 are connected together and connected to the second current-carrying line 120, and the third resistor R3 and the sixth resistor R6 are connected together and connected to the first current-carrying line 110;

[0187] The trigger module 240 is coupled with the leakage detection module 220, the open circuit detection module 230 and the switch module 210, and is configured to receive a leakage signal and / or an open circuit signal, and drive the switch module 210 to disconnect the power connection in response to the leakage signal and / or the open circuit signal; the trigger module 240 includes a voltage stabilizing unit ZD1 and a third switch unit 241 that drives the switch module 210 to disconnect the power connection when turned on; the control pin of the third switch unit 241 is connected to the collector of the first transistor Q1 and the collector of the second transistor Q2 to obtain the open circuit signal; the positive electrode of the voltage stabilizing unit ZD1 is connected to the control pin of the third switch unit 241, and the negative electrode is connected to the sixth terminal f to obtain the leakage signal;

[0188] The leakage simulation module 250 includes a third test switch TEST3 and a fourteenth resistor R14; one end of the third test switch TEST3 is connected to the connection point of the second resistor R2 and the fifth resistor R5, the other end of the third test switch TEST3 is connected to one end of the fourteenth resistor R14, and the other end of the fourteenth resistor R14 is connected to the third end c.

[0189] Below, Fig.14 The embodiment shown introduces the operation of the detection protection device provided by the embodiment of the utility model under various leakage and open circuit conditions:

[0190] 1. When the leakage signal of the first current-carrying line 110 is transmitted to the first shielding conductor structure 221:

[0191] After the first shielding conductor structure 221 obtains the leakage signal, it is transmitted to the sixth end f so that the voltage stabilizing unit ZD1 is broken down, forming a conducting path of the first current-carrying line 110-first shielding conductor structure 221-eleventh resistor R11-voltage stabilizing unit ZD1-tenth resistor R10-seventh resistor R7-second diode D2-tripping coil Lx-second current-carrying line 120;

[0192] The voltage of the control electrode of the thyristor Q3 increases, and when the negative half cycle of the AC power source comes, that is, the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120-tripping coil Lx-thyristor Q3-first diode D1-first current-carrying line 110;

[0193] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0194] 2. When the leakage signal of the second current-carrying line 120 is transmitted to the second shielding conductor structure 222:

[0195] After the second shielding conductor structure 222 obtains the leakage signal, it is transmitted to the sixth end f so that the voltage stabilizing unit ZD1 is broken down, forming a conduction path of the second current-carrying line 120-the second shielding conductor structure 222-the eleventh resistor R11-the voltage stabilizing unit ZD1-the tenth resistor R10-the seventh resistor R7-the first diode D1-the first current-carrying line 110;

[0196] The voltage of the control electrode of the thyristor Q3 increases, and when the negative half cycle of the AC power source comes, that is, the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120-tripping coil Lx-thyristor Q3-first diode D1-first current-carrying line 110;

[0197] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0198] 3. When the first shielding conductor structure 221 is located between the first end a and the third end c and is open:

[0199] The short-circuit path between the first end a and the fourth end d is disconnected, and the two ends of the first bias unit (the first resistor R1 and the twelfth resistor R12) are no longer short-circuited; the two ends of the second bias unit (the fourth resistor R4 and the thirteenth resistor R13) are still short-circuited, and the second bias unit is short-circuited by the conduction path of the second end b-the third end c-the sixth end f-the fifth end e; it should be noted that the conduction path of the second end b-the third end c-the sixth end f-the fourth end d exists at the same time;

[0200] A conducting path of the second current-carrying line 120 - tripping coil Lx - second resistor R2 - first resistor R1 - twelfth resistor R12 - third resistor R3 - first diode D1 - first current-carrying line 110 is formed;

[0201] The first transistor Q1 is turned on, and the second transistor Q2 is kept turned off; forming a conduction path of the second current-carrying line 120-tripping coil Lx-second resistor R2-first transistor Q1-tenth resistor R10-seventh resistor R7-first diode D1-first current-carrying line 110;

[0202] The voltage of the control electrode of the thyristor Q3 increases, and when the negative half cycle of the AC power source comes, that is, the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120-tripping coil Lx-thyristor Q3-first diode D1-first current-carrying line 110;

[0203] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0204] 4. When the first shielding conductor structure 221 is located between the second end b and the third end c and is open:

[0205] The short-circuit path between the second end b and the fifth end e is disconnected, and the two ends of the second bias unit (the fourth resistor R4 and the thirteenth resistor R13) are no longer short-circuited; the two ends of the first bias unit (the first resistor R1 and the twelfth resistor R12) are still short-circuited, and the first bias unit is short-circuited by the conductive path of the first end a-the third end c-the sixth end f-the fourth end d; it should be noted that the conductive path of the first end a-the third end c-the sixth end f-the fifth end e exists at the same time;

[0206] A conducting path of the second current-carrying line 120 - tripping coil Lx - fifth resistor R5 - fourth resistor R4 - thirteenth resistor R13 - sixth resistor R6 - first diode D1 - first current-carrying line 110 is formed;

[0207] The second transistor Q2 is turned on, and the first transistor Q1 is kept turned off; forming a conduction path of the second current-carrying line 120-tripping coil Lx-fifth resistor R5-second transistor Q2-tenth resistor R10-seventh resistor R7-first diode D1-first current-carrying line 110;

[0208] The voltage of the control electrode of the thyristor Q3 increases, and when the negative half cycle of the AC power source comes, that is, the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120-tripping coil Lx-thyristor Q3-first diode D1-first current-carrying line 110;

[0209] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0210] 5. When the connecting conductor between the third terminal c and the sixth terminal f is open:

[0211] The short-circuit path between the first end a and the fourth end d is disconnected, and the two ends of the first bias unit (the first resistor R1 and the twelfth resistor R12) are no longer short-circuited; the short-circuit path between the second end b and the fifth end e is disconnected, and the two ends of the second bias unit (the fourth resistor R4 and the thirteenth resistor R13) are no longer short-circuited;

[0212] Forming a conducting path of the second current-carrying line 120-tripping coil Lx-second resistor R2-first resistor R1-twelfth resistor R12-third resistor R3-first diode D1-first current-carrying line 110, and forming a conducting path of the second current-carrying line 120-tripping coil Lx-fifth resistor R5-fourth resistor R4-thirteenth resistor R13-sixth resistor R6-first diode D1-first current-carrying line 110;

[0213] The first transistor Q1 and the second transistor Q2 are both turned on; forming a conduction path of the second current-carrying line 120-tripping coil Lx-second resistor R2-first transistor Q1-tenth resistor R10-seventh resistor R7-first diode D1-first current-carrying line 110, and forming a conduction path of the second current-carrying line 120-tripping coil Lx-fifth resistor R5-second transistor Q2-tenth resistor R10-seventh resistor R7-first diode D1-first current-carrying line 110;

[0214] The voltage of the control electrode of the thyristor Q3 increases, and when the negative half cycle of the AC power source comes, that is, the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120-tripping coil Lx-thyristor Q3-first diode D1-first current-carrying line 110;

[0215] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0216] 6. When the portion of the second shielding conductor structure 222 between the fourth end d and the sixth end f is open:

[0217] The short-circuit path between the first end a and the fourth end d is disconnected, and the two ends of the first bias unit (the first resistor R1 and the twelfth resistor R12) are no longer short-circuited; the two ends of the second bias unit (the fourth resistor R4 and the thirteenth resistor R13) are still short-circuited, and the second bias unit is short-circuited by the conduction path of the second end b-the third end c-the sixth end f-the fifth end e; it should be noted that the conduction path of the first end a-the third end c-the sixth end f-the fifth end e exists at the same time;

[0218] A conducting path of the second current-carrying line 120 - tripping coil Lx - second resistor R2 - first resistor R1 - twelfth resistor R12 - third resistor R3 - first diode D1 - first current-carrying line 110 is formed;

[0219] The first transistor Q1 is turned on, and the second transistor Q2 is kept turned off; forming a conduction path of the second current-carrying line 120-tripping coil Lx-second resistor R2-first transistor Q1-tenth resistor R10-seventh resistor R7-first diode D1-first current-carrying line 110;

[0220] The voltage of the control electrode of the thyristor Q3 increases, and when the negative half cycle of the AC power source comes, that is, the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120-tripping coil Lx-thyristor Q3-first diode D1-first current-carrying line 110;

[0221] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0222] 7. When the portion of the second shielding conductor structure 222 between the fifth end e and the sixth end f is open:

[0223] The short-circuit path between the second end b and the fifth end e is disconnected, and the two ends of the second bias unit (the fourth resistor R4 and the thirteenth resistor R13) are no longer short-circuited; the two ends of the first bias unit (the first resistor R1 and the twelfth resistor R12) are still short-circuited, and the first bias unit is short-circuited by the conduction path of the first end a-the third end c-the sixth end f-the fourth end d; it should be noted that the conduction path of the second end b-the third end c-the sixth end f-the fourth end d exists at the same time;

[0224] A conducting path of the second current-carrying line 120 - tripping coil Lx - fifth resistor R5 - fourth resistor R4 - thirteenth resistor R13 - sixth resistor R6 - first diode D1 - first current-carrying line 110 is formed;

[0225] The second transistor Q2 is turned on, and the first transistor Q1 is kept turned off; forming a conduction path of the second current-carrying line 120-tripping coil Lx-fifth resistor R5-second transistor Q2-tenth resistor R10-seventh resistor R7-first diode D1-first current-carrying line 110;

[0226] The voltage of the control electrode of the thyristor Q3 increases, and when the negative half cycle of the AC power source comes, that is, the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120-tripping coil Lx-thyristor Q3-first diode D1-first current-carrying line 110;

[0227] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0228] 8. When the open circuit detection module 230 works normally and the first shielding conductor structure 221 and the second shielding conductor structure 222 do not have an open circuit:

[0229] The potential on the first shielded conductor structure 221 and the second shielded conductor structure 222 in the leakage detection module 220 is determined by a first equivalent resistor formed by connecting the second resistor R2 and the fifth resistor R5 in parallel and a second equivalent resistor formed by connecting the third resistor R3 and the sixth resistor R6 in parallel, and is at a level that will not cause the voltage stabilizing unit ZD1 to be broken down;

[0230] At this time, if the third test switch TEST3 is pressed, it is equivalent to connecting the fourteenth resistor R14 in parallel with the second resistor R2 and the fifth resistor R5, so that the first equivalent resistance becomes smaller, resulting in an increase in the potential of the first shielding conductor structure 221 and the second shielding conductor structure 222, which will cause the voltage stabilizing unit ZD1 to be broken down, forming a conduction path of the second current-carrying line 120-tripping coil Lx-third test switch TEST3-fourteenth resistor R14-first shielding conductor structure 221 / second shielding conductor structure 222-eleventh resistor R11-voltage stabilizing unit ZD1-tenth resistor R10-seventh resistor R7-first diode D1-first current-carrying line 110;

[0231] The voltage of the control electrode of the thyristor Q3 increases, and when the negative half cycle of the AC power source comes, that is, the level of the second current-carrying line 120 is greater than the level of the first current-carrying line 110, the thyristor Q3 is turned on, forming a strong current path of the second current-carrying line 120-tripping coil Lx-thyristor Q3-first diode D1-first current-carrying line 110;

[0232] The trip coil Lx generates a strong electromagnetic force, thereby driving the switch module 210 to disconnect the power connection between the input end and the output end of the power line.

[0233] 9. When the open circuit detection module 230 fails, such as a single device is open or short-circuited, the potential of the first shielding conductor structure 221 and the second shielding conductor structure 222 will change, which will lead to two situations. One is that the increase in the potential of the first shielding conductor structure 221 and the second shielding conductor structure 222 directly causes the voltage stabilizing unit ZD1 to be broken down, resulting in tripping; the other is that the potential of the first shielding conductor structure 221 and the second shielding conductor structure 222 decreases, resulting in the user actively pressing the third test switch TEST3 for testing without triggering tripping.

[0234] The following lists various single device failures that may occur in the open circuit detection module 230:

[0235] 9.1. When an open circuit fault occurs in the second resistor R2 in the open circuit detection module 230, the first equivalent resistor increases, causing the potential of the first shielding conductor structure 221 and the second shielding conductor structure 222 to drop, and the voltage stabilizing unit ZD1 remains in a state of not being broken down;

[0236] It should be noted that, in this case, the open circuit detection module 230 cannot trigger tripping in response to the partial open circuit situation of the first shielding conductor structure 221 between the first end a and the third end c, but can still trigger tripping in response to four open circuit situations, namely, the partial open circuit of the first shielding conductor structure 221 between the second end b and the third end c, the open circuit of the connecting conductor between the third end c and the sixth end f, the partial open circuit of the second shielding conductor structure 222 between the fourth end d and the sixth end f, and the partial open circuit of the second shielding conductor structure 222 between the fifth end e and the sixth end f;

[0237] It can be seen that in this case, if a part of the first shielding conductor structure 221 between the first end a and the third end c is open, the user cannot find it, which may cause safety hazards.

[0238] 9.2. When an open circuit fault occurs in the fifth resistor R5 in the open circuit detection module 230, the situation is similar to the situation when an open circuit fault occurs in the second resistor R2 in 9.1.

[0239] 9.3. When an open circuit fault occurs in the third resistor R3 in the open circuit detection module 230, the second equivalent resistance decreases, causing the potential of the first shielding conductor structure 221 and the second shielding conductor structure 222 to increase, which will cause the voltage stabilizing unit ZD1 to be broken down and trigger a trip.

[0240] 9.4. When an open circuit fault occurs in the sixth resistor R6 in the open circuit detection module 230, the situation is similar to the situation when an open circuit fault occurs in the third resistor R3 in 9.3.

[0241] 9.5. When an open circuit fault occurs in the first transistor Q1 in the open circuit detection module 230, the open circuit detection module 230 cannot trigger a trip in response to the partial open circuit condition of the first shielding conductor structure 221 between the first end a and the third end c;

[0242] It can be seen that in this case, if a part of the first shielding conductor structure 221 between the first end a and the third end c is open, the user cannot find it, which may cause safety hazards.

[0243] 9.6. When the second transistor Q2, the twelfth resistor R12, and the thirteenth resistor R13 in the open circuit detection module 230 have an open circuit fault, it is similar to the situation in which the first transistor Q1 has an open circuit fault in 9.5.

[0244] 9.7. When a short circuit fault occurs in the second resistor R2 in the open circuit detection module 230, the first equivalent resistance becomes zero, causing the potential of the first shielding conductor structure 221 and the second shielding conductor structure 222 to increase, causing the voltage stabilizing unit ZD1 to be broken down and trigger a trip.

[0245] 9.8. When the fifth resistor R5 in the open circuit detection module 230 has a short circuit fault, it is similar to the situation in which the second resistor R2 has a short circuit fault in 9.7.

[0246] 9.9. When a short circuit fault occurs in the third resistor R3 in the open circuit detection module 230, the second equivalent resistance becomes zero, causing the potential of the first shielding conductor structure 221 and the second shielding conductor structure 222 to drop, and the voltage stabilizing unit ZD1 remains in an unbroken state.

[0247] 9.10. When a short circuit fault occurs in the sixth resistor R6 in the open circuit detection module 230, it is similar to the situation in which a short circuit fault occurs in the third resistor R3 in 9.9.

[0248] 9.11. When a short circuit fault occurs in the first transistor Q1 in the open circuit detection module 230, the voltage of the control electrode of the thyristor Q3 will increase and trigger a trip.

[0249] 9.12. When a short circuit fault occurs in the second transistor Q2 in the open circuit detection module 230, the situation is similar to the situation when a short circuit fault occurs in the first transistor Q1 in 9.11.

[0250] For the single device failure of the above-mentioned open circuit detection modules 230 such as 9.3, 9.4, 9.7, 9.8, 9.11 and 9.12, it will directly cause tripping, so that the user will not continue to use the power cord;

[0251] For the single device failure of the various open circuit detection modules 230 such as 9.1, 9.2, 9.5, 9.6, 9.9 and 9.10 mentioned above, tripping will not be triggered, and users cannot find it, which will pose a safety hazard; on this basis, if the user actively presses the third test switch TEST3 for testing, the potential of the first shielding conductor structure 221 and the second shielding conductor structure 222 has been changed. After pressing the third test switch TEST3, the potential of the first shielding conductor structure 221 and the second shielding conductor structure 222 is still not high enough to cause the voltage stabilizing unit ZD1 to be broken down and trigger tripping, so that the user can intuitively see that the tripping is not triggered after pressing the third test switch TEST3, so as to judge that the detection protection device is abnormal and cannot play the role of leakage protection or cannot play the role of open circuit protection of the shielding structure, so as to stop using the faulty product, thereby further improving safety protection.

[0252] Reference Fig.15 The second aspect of the utility model provides an electrical connection device 300, including a detection and protection device, a shell 310 and a power cord as described above in the first aspect of the utility model, wherein the power cord is connected to the shell 310, and the switch module 210, the open circuit detection module 230 and the trigger module 240 are arranged in the shell 310.

[0253] In addition, a third aspect of the present invention provides an electrical device, including a load device and the electrical connection device 300 of the second aspect of the present invention, wherein the output end of the power line is connected to the load device.

[0254] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A detection and protection device for a power line, characterized in that: The power line includes a first current-carrying line and a second current-carrying line, and the detection protection device includes: A switch module, used to control the power connection between the input end and the output end of the power line; A leakage detection module, comprising a first shielded conductor structure covering the first current-carrying line and a second shielded conductor structure covering the second current-carrying line; the first shielded conductor structure is used to collect leakage signals of the first current-carrying line, and the second shielded conductor structure is used to collect leakage signals of the second current-carrying line; the first shielded conductor structure comprises a first end close to the input end of the power line, a second end close to the output end of the power line, and a third end between the first end and the second end; the second shielded conductor structure comprises a fourth end close to the input end, a fifth end close to the output end, and a sixth end between the fourth end and the fifth end; the third end is connected to the sixth end; an open circuit detection module, connected to the first end, the second end, the fourth end and the fifth end respectively, the open circuit detection module being configured to generate an open circuit signal when at least a portion of the first shielding conductor structure and / or the second shielding conductor structure is open circuit; A trigger module is coupled to the leakage detection module, the open circuit detection module and the switch module, and is configured to receive the leakage signal and / or the open circuit signal, and drive the switch module to disconnect the power connection in response to the leakage signal and / or the open circuit signal.

2. The detection and protection device according to claim 1, characterized in that: The trigger module includes a voltage stabilizing unit and a third switch unit that drives the switch module to disconnect the power connection when turned on, and the control pin of the third switch unit is connected to the open circuit detection module to obtain the open circuit signal; the negative electrode of the voltage stabilizing unit is connected to the first shielding conductor structure and / or the second shielding conductor structure to obtain the leakage signal in the first shielding conductor structure and / or the second shielding conductor structure, and the positive electrode is connected to the control pin of the third switch unit.

3. The detection and protection device according to claim 2, characterized in that: The negative electrode of the voltage stabilizing unit is connected to any one of the following: the first end; the second end; the third end; the fourth end; the fifth end; The sixth end.

4. The detection and protection device according to claim 1, characterized in that: The open circuit detection module includes a first switch unit and a second switch unit; One end of the first switch unit is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the trigger module, the open circuit detection module further includes a first bias unit for providing a switch-on signal to the first switch unit, one end of the first bias unit is connected to the first end, and the other end is connected to the fourth end; One end of the second switch unit is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the trigger module. The open circuit detection module also includes a second bias unit for providing a conduction switching signal to the second switch unit, one end of the second bias unit is connected to the second end, and the other end is connected to the fifth end.

5. The detection and protection device according to claim 4, characterized in that: The first bias unit is configured to: when any part of the first shielded conductor structure and the second shielded conductor structure between the first end and the fourth end is open-circuited, provide a switch-on signal to the first switch unit to turn on the first switch unit, so that the first switch unit sends an open-circuit signal to the trigger module; the second bias unit is configured to: when any part of the first shielded conductor structure and the second shielded conductor structure between the second end and the fifth end is open-circuited, provide a switch-on signal to the second switch unit to turn on the second switch unit, so that the second switch unit sends an open-circuit signal to the trigger module.

6. The detection and protection device according to claim 5, characterized in that: The first switch unit includes a first transistor, the first bias unit includes a first resistor, and the open circuit detection module also includes a second resistor and a third resistor, one end of the first resistor is connected to the first end, the emitter of the first transistor and one end of the second resistor, the other end of the second resistor is connected to one of the first current-carrying line and the second current-carrying line, the other end of the first resistor is connected to the fourth end, the base of the first transistor and one end of the third resistor, the other end of the third resistor is connected to the other of the first current-carrying line and the second current-carrying line, and the collector of the first transistor is connected to the trigger module.

7. The detection and protection device according to claim 5, characterized in that: The second switch unit includes a second transistor, the second bias unit includes a fourth resistor, and the open circuit detection module also includes a fifth resistor and a sixth resistor, one end of the fourth resistor is connected to the second end, the emitter of the second transistor and one end of the fifth resistor, the other end of the fifth resistor is connected to one of the first current-carrying line and the second current-carrying line, the other end of the fourth resistor is connected to the fifth end, the base of the second transistor and one end of the sixth resistor, the other end of the sixth resistor is connected to the other of the first current-carrying line and the second current-carrying line, and the collector of the second transistor is connected to the trigger module.

8. The detection and protection device according to claim 1, characterized in that: The open circuit detection module includes a first switch unit and a second switch unit; One end of the first switch unit is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the trigger module, the open circuit detection module further includes a first bias unit for providing a switch-on signal to the first switch unit, one end of the first bias unit is connected to the first end, and the other end is connected to the fifth end; One end of the second switch unit is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the trigger module. The open circuit detection module also includes a second bias unit for providing a conduction switching signal for the second switch unit, one end of the second bias unit is connected to the second end, and the other end is connected to the fourth end.

9. The detection and protection device according to claim 2, characterized in that: The trigger module further includes a trip coil for generating an electromagnetic force to drive the switch module to disconnect the power connection, and the trip coil and the third switch unit are connected in series between the first current-carrying line and the second current-carrying line.

10. The detection and protection device according to claim 9, characterized in that: The third switch unit includes a thyristor, and the trigger module also includes a seventh resistor. The control electrode of the thyristor is respectively connected to one end of the seventh resistor, the positive electrode of the voltage stabilizing unit and the open circuit detection module, the other end of the seventh resistor and the cathode of the thyristor are connected to the first current-carrying line, and the anode of the thyristor is connected to the second current-carrying line through the tripping coil.

11. The detection and protection device according to claim 10, characterized in that: The trigger module also includes a first capacitor connected in parallel with the seventh resistor.

12. The detection and protection device according to claim 10, characterized in that: The trigger module also includes a first diode and a second diode, the other end of the seventh resistor and the cathode of the thyristor are connected to the anode of the first diode and the anode of the second diode, the cathode of the first diode is connected to the first current-carrying line, and the cathode of the second diode is connected to the connection point between the thyristor and the tripping coil.

13. The detection and protection device according to claim 1 or 2, characterized in that: It also includes a leakage simulation module, which includes a first test switch, one end of which is connected to the first current-carrying line or the second current-carrying line, and the other end of which is connected to the first shielding conductor structure and / or the second shielding conductor structure.

14. The detection and protection device according to claim 13, characterized in that: The leakage simulation module also includes an eighth resistor and a ninth resistor, the other end of the first test switch is respectively connected to one end of the eighth resistor and one end of the ninth resistor, and the other end of the eighth resistor and the other end of the ninth resistor are respectively connected to two of the first end, the second end, the third end, the fourth end, the fifth end and the sixth end.

15. The detection and protection device according to claim 2, characterized in that: It also includes a second test switch, one end of which is connected to the first current-carrying line or the second current-carrying line, and the other end of which is connected to the control pin of the third switch unit.

16. The detection and protection device according to claim 2, characterized in that: It also includes a leakage simulation module, which includes a third test switch and a fourteenth resistor, one end of the third test switch is connected to the first current-carrying line or the second current-carrying line, and the other end is connected to the first shielding conductor structure and / or the second shielding conductor structure through the fourteenth resistor, and the fourteenth resistor is configured to: when the third test switch is pressed and the open circuit detection module fails, adjust the potential of the negative electrode of the voltage stabilizing unit to prevent the voltage stabilizing unit from being broken down.

17. The detection and protection device according to claim 2, characterized in that: The trigger module also includes a tenth resistor and an eleventh resistor, the negative electrode of the voltage stabilizing unit is connected to the first shielding conductor structure and / or the second shielding conductor structure through the eleventh resistor, and the open circuit detection module is connected to the negative electrode of the voltage stabilizing unit through the tenth resistor, so that the third switch unit obtains the open circuit signal through the tenth resistor.

18. The detection and protection device according to claim 5, characterized in that: The first switch unit includes a first transistor, and the first bias unit includes a first resistor and a twelfth resistor; The second switch unit includes a second triode, and the second bias unit includes a fourth resistor and a thirteenth resistor; The open circuit detection module also includes a second resistor, a third resistor, a fifth resistor and a sixth resistor; The emitter of the first transistor is connected to one end of the first resistor, the first end and one end of the second resistor, the base of the first transistor is connected to the other end of the first resistor and one end of the twelfth resistor, and the other end of the twelfth resistor is connected to the fourth end and one end of the third resistor; The emitter of the second transistor is connected to one end of the fourth resistor, the second end and one end of the fifth resistor, the base of the second transistor is connected to the other end of the fourth resistor and one end of the thirteenth resistor, and the other end of the thirteenth resistor is connected to the fifth end and one end of the sixth resistor; The other end of the second resistor is connected together with the other end of the fifth resistor and connected to one of the first current-carrying line and the second current-carrying line, the other end of the third resistor is connected together with the other end of the sixth resistor and connected to the other of the first current-carrying line and the second current-carrying line, and the collector of the first transistor is connected together with the collector of the second transistor and connected to the trigger module.

19. The detection and protection device according to claim 18, characterized in that: The trigger module includes a voltage stabilizing unit and a third switch unit that drives the switch module to disconnect the power connection when turned on, and the control pin of the third switch unit is connected to the collector of the first transistor and the collector of the second transistor to obtain the open circuit signal; the negative electrode of the voltage stabilizing unit is connected to the first shielding conductor structure and / or the second shielding conductor structure to obtain the leakage signal in the first shielding conductor structure and / or the second shielding conductor structure, and the positive electrode of the voltage stabilizing unit is connected to the control pin of the third switch unit.

20. The detection and protection device according to claim 19, characterized in that: It also includes a leakage simulation module, which includes a third test switch, one end of the third test switch is connected to the connection point between the second resistor and the fifth resistor, and the other end of the third test switch is connected to the first shielding conductor structure and / or the second shielding conductor structure.

21. The detection and protection device according to claim 20, characterized in that: The leakage simulation module also includes a fourteenth resistor, the other end of the third test switch is connected to one end of the fourteenth resistor, and the other end of the fourteenth resistor is connected to the third end; the negative electrode of the voltage stabilizing unit is connected to the sixth end; the fourteenth resistor is configured to: when the third test switch is pressed and the open circuit detection module fails, adjust the potential of the negative electrode of the voltage stabilizing unit to prevent the voltage stabilizing unit from being broken down.

22. The detection and protection device according to claim 1, characterized in that: Also includes leakage simulation module; The open circuit detection module includes a first triode, a first voltage dividing unit, a second triode and a second voltage dividing unit; The first voltage dividing unit comprises a second resistor, a first resistor, a twelfth resistor and a third resistor connected in series in sequence, wherein a connection point between the second resistor and the first resistor is connected to the first end and the emitter of the first transistor; a connection point between the first resistor and the twelfth resistor is connected to the base of the first transistor; and a connection point between the twelfth resistor and the third resistor is connected to the fourth end; The second voltage dividing unit comprises a fifth resistor, a fourth resistor, a thirteenth resistor and a sixth resistor connected in series in sequence; a connection point between the fifth resistor and the fourth resistor is connected to the second end and the emitter of the second triode; a connection point between the fourth resistor and the thirteenth resistor is connected to the base of the second triode; a connection point between the thirteenth resistor and the sixth resistor is connected to the fifth end; The second resistor and the fifth resistor are connected together and connected to the second current-carrying line, and the third resistor and the sixth resistor are connected together and connected to the first current-carrying line; The trigger module includes a voltage stabilizing unit and a third switch unit that drives the switch module to disconnect the power connection when turned on; the control pin of the third switch unit is connected to the collector of the first transistor and the collector of the second transistor to obtain the open circuit signal; the positive electrode of the voltage stabilizing unit is connected to the control pin of the third switch unit, and the negative electrode is connected to the sixth end to obtain the leakage signal; The leakage simulation module includes a third test switch and a fourteenth resistor; one end of the third test switch is connected to a connection point between the second resistor and the fifth resistor, the other end of the third test switch is connected to one end of the fourteenth resistor, and the other end of the fourteenth resistor is connected to the third end.

23. An electrical connection device, characterized in that: It comprises the detection and protection device according to any one of claims 1 to 22, a shell and the power cord, the power cord is connected to the shell, and the switch module, the open circuit detection module and the trigger module are arranged in the shell.

24. An electrical equipment, characterized in that: The device comprises a load device and the electrical connection device according to claim 23, wherein the output end of the power line is connected to the load device.

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